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2017年08月22日
Pure Nature Specials - The Crystal Ocean
Pure Nature Specials - The Crystal Ocean
https://youtu.be/iZwCxaEbzUs
Pure Nature Specials - The Crystal Ocean
https://youtu.be/iZwCxaEbzUs
Published on Sep 28, 2015
Nowhere in the world is the pulse of the seasons more dramatic than in the waters surrounding Antarctica. The great ocean becomes so cold that it freezes solid.
The largest collection of high-quality documentary content on the planet! Nature, Science, History, Adrenaline, Paranormal! App coming soon to IOS, Android, .
Category Science & Technology
License Standard YouTube License
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https://youtu.be/iZwCxaEbzUs
Pure Nature Specials - The Crystal Ocean
https://youtu.be/iZwCxaEbzUs
Published on Sep 28, 2015
Nowhere in the world is the pulse of the seasons more dramatic than in the waters surrounding Antarctica. The great ocean becomes so cold that it freezes solid.
The largest collection of high-quality documentary content on the planet! Nature, Science, History, Adrenaline, Paranormal! App coming soon to IOS, Android, .
Category Science & Technology
License Standard YouTube License
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Japanese Tea Ceremony
Japanese Tea Ceremony
https://youtu.be/5LOZe_FSl2o
Published on Dec 14, 2011
Produced and Directed by Vanessa Anthony
Category Entertainment
License Standard YouTube License
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 | 【送料無料※一部地域を除く】【茶道具/茶道】野点セット網代かごタイプ （網代かご、抹茶、茶筅、抹茶茶碗、茶杓、小風呂敷） 価格:6,315円 |
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Japanese Chado Matcha Green Tea Ceremony
Japanese Chado Matcha Green Tea Ceremony #TeaStories | TEALEAVES
https://youtu.be/fmukjUoevf4
Japanese Chado Matcha Green Tea Ceremony
https://youtu.be/fmukjUoevf4
Published on Mar 20, 2015
It is our privilege to film this beautiful Chado ceremony, which has been an important inspiration for TEALEAVES since our founding in 1994. We gratefully thank our friends Kazue Kojima, June Yoriko Tanemura, and Yasuko Takahashi who all practice the Japanese Way of Tea in Vancouver.
New videos weekly. Make sure to subscribe to stay in the know about future Tealeaves projects and collaborations http://bit.ly/1M9G6g9
Learn about this ceremony & tea culture: http://bit.ly/1Hf77XO
Visit the Nitobe Memorial Garden for an opportunity to experience the tea ceremony: http://www.botanicalgarden.ubc.ca/nit...
Where to buy:
Tencha Matcha High Energy : http://bit.ly/1HbrRo1
More on Tea Culture:
A Russian Tea Samovar Story: http://bit.ly/1FL56FK
A Brazilian Yerba Mate Tea Story: http://bit.ly/1GzfYF8
A Chinese Yixing Tea Story: http://bit.ly/19F7ou7
Business Inquiries: info@tealeaves.com
Where to find us:
Website: http://www.tealeaves.com
Blog (Folio): http://www.folio.tealeaves.com
Facebook: http://www.facebook.com/TealeavesCo
Twitter: http://www.twitter.com/TealeavesCo
Instagram: http://www.instagram.com/TealeavesCo
Pinterest: http://www.pinterest.com/TealeavesCo/
About us: Known as the luxury tea blender to Michelin Chefs and five-star hotels worldwide, Tealeaves brings you not only an exquisite cup, but a way of living, beautifully. Order online for quality tea to your doorstep.
Category Howto & Style
License Standard YouTube License
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https://youtu.be/fmukjUoevf4
Japanese Chado Matcha Green Tea Ceremony
https://youtu.be/fmukjUoevf4
Published on Mar 20, 2015
It is our privilege to film this beautiful Chado ceremony, which has been an important inspiration for TEALEAVES since our founding in 1994. We gratefully thank our friends Kazue Kojima, June Yoriko Tanemura, and Yasuko Takahashi who all practice the Japanese Way of Tea in Vancouver.
New videos weekly. Make sure to subscribe to stay in the know about future Tealeaves projects and collaborations http://bit.ly/1M9G6g9
Learn about this ceremony & tea culture: http://bit.ly/1Hf77XO
Visit the Nitobe Memorial Garden for an opportunity to experience the tea ceremony: http://www.botanicalgarden.ubc.ca/nit...
Where to buy:
Tencha Matcha High Energy : http://bit.ly/1HbrRo1
More on Tea Culture:
A Russian Tea Samovar Story: http://bit.ly/1FL56FK
A Brazilian Yerba Mate Tea Story: http://bit.ly/1GzfYF8
A Chinese Yixing Tea Story: http://bit.ly/19F7ou7
Business Inquiries: info@tealeaves.com
Where to find us:
Website: http://www.tealeaves.com
Blog (Folio): http://www.folio.tealeaves.com
Facebook: http://www.facebook.com/TealeavesCo
Twitter: http://www.twitter.com/TealeavesCo
Instagram: http://www.instagram.com/TealeavesCo
Pinterest: http://www.pinterest.com/TealeavesCo/
About us: Known as the luxury tea blender to Michelin Chefs and five-star hotels worldwide, Tealeaves brings you not only an exquisite cup, but a way of living, beautifully. Order online for quality tea to your doorstep.
Category Howto & Style
License Standard YouTube License
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2017年08月21日
Documentary: Japanese Tea Ceremony
Documentary: Japanese Tea Ceremony
https://youtu.be/gx59Y8VFse0
Documentary: Japanese Tea Ceremony
https://youtu.be/gx59Y8VFse0
Published on Mar 2, 2015
The Japanese tea ceremony is a special way of making green tea (matcha 抹茶). It is called the Way of Tea. It is a Japanese cultural activity involving the ceremonial preparation and presentation of matcha, powdered tea. People who study the tea ceremony have to learn about different kinds of tea. They also have to learn about kimono (Japanese clothes), flowers, and many other things. It takes much practice to learn the tea ceremony. Zen Buddhism was a primary influence in the development of the Japanese tea ceremony.
SOURCE: http://beginjapanology.com
Category Education
License Standard YouTube License
Music "Kataribe (Piano With Strings)" by Missa Johnouchi (Google Play • iTunes)
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https://youtu.be/gx59Y8VFse0
Documentary: Japanese Tea Ceremony
https://youtu.be/gx59Y8VFse0
Published on Mar 2, 2015
The Japanese tea ceremony is a special way of making green tea (matcha 抹茶). It is called the Way of Tea. It is a Japanese cultural activity involving the ceremonial preparation and presentation of matcha, powdered tea. People who study the tea ceremony have to learn about different kinds of tea. They also have to learn about kimono (Japanese clothes), flowers, and many other things. It takes much practice to learn the tea ceremony. Zen Buddhism was a primary influence in the development of the Japanese tea ceremony.
SOURCE: http://beginjapanology.com
Category Education
License Standard YouTube License
Music "Kataribe (Piano With Strings)" by Missa Johnouchi (Google Play • iTunes)
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Future Aircraft - NASA Documentary
Future Aircraft - NASA Documentary
https://youtu.be/Y1gAusOW-RU
Future Aircraft - NASA Documentary
https://youtu.be/Y1gAusOW-RU
Published on Feb 8, 2016
When Orville Wright traveled to Cleveland for the dedication of the Aircraft Engine Research Laboratory in the 1940s, he had already witnessed the advancement of aircraft from his Kitty Hawk model to the winged machines that fought in World War II. Today, the lab, now known as NASA Glenn Research Center, has engineers and scientists engaged in an agency-wide effort to develop alternative aircraft designs using low-carbon propulsion technology for larger passenger aircraft that Wright may have never dreamed of. Since the beginning, commercial planes have been powered by carbon-based fuels such as gasoline or kerosene. While these provide the energy to lift large commercial jets into the world’s airspace, electric power is now seen as a new frontier for providing thrust and power for flight.
Just as hybrid or turboelectric power has improved fuel efficiency in cars, boats and trains, aeronautical engineers are exploring how planes can be redesigned and configured with electrical power.
One of NASA’s goals is to help the aircraft industry shift from relying solely on gas turbines to using hybrid electric and turboelectric propulsion in order to reduce energy consumption, emissions and noise.
“Aircraft are highly complex machines,” says Jim Heidmann, manager for NASA’s Advanced Air Transport Technology project. “Moving toward alternative systems requires creating new aircraft designs as well as propulsion systems that integrate battery technologies and electromagnetic machines like motors and generators with more efficient engines.”
Glenn researchers are looking at power systems that generate electricity in place of, or in addition to, thrust at the turbine engine and then convert that electricity to be converted into thrust using fans at other places on the aircraft.
“These systems use electric motors and generators that work together with turbine engines to distribute power throughout the aircraft in order to reduce drag for a given amount of fuel burned,” says Amy Jankovsky, subproject lead engineer. “Part of our research is developing the lightweight machinery and electrical systems that will be required to make these systems possible.”
In addition to designing better motors, generators and integrated electrical system architectures, Glenn engineers are also researching the basic materials that go into those components. Research is being performed on the conductors inside, and the insulation around the wires. Along with studying the design of motors and the architecture of power electronics, engineers are improving magnetic materials and semi-conductors to make these motors and electronics lighter and more efficient.
“Our work is laying a foundation for planes that will require less fossil fuel in the future,” says Glenn Engineer Cheryl Bowman, a technical lead on the project. “Considering that the U.S. aviation industry carries over 700 million passengers every year, making each trip more fuel efficient (by up to 30 percent) can have a considerable impact on the nation’s total use of fossil fuels.”
Nancy Smith Kilkenny, ATS
NASA's Glenn Research Center
Category Howto & Style
License Standard YouTube License
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https://youtu.be/Y1gAusOW-RU
Future Aircraft - NASA Documentary
https://youtu.be/Y1gAusOW-RU
Published on Feb 8, 2016
When Orville Wright traveled to Cleveland for the dedication of the Aircraft Engine Research Laboratory in the 1940s, he had already witnessed the advancement of aircraft from his Kitty Hawk model to the winged machines that fought in World War II. Today, the lab, now known as NASA Glenn Research Center, has engineers and scientists engaged in an agency-wide effort to develop alternative aircraft designs using low-carbon propulsion technology for larger passenger aircraft that Wright may have never dreamed of. Since the beginning, commercial planes have been powered by carbon-based fuels such as gasoline or kerosene. While these provide the energy to lift large commercial jets into the world’s airspace, electric power is now seen as a new frontier for providing thrust and power for flight.
Just as hybrid or turboelectric power has improved fuel efficiency in cars, boats and trains, aeronautical engineers are exploring how planes can be redesigned and configured with electrical power.
One of NASA’s goals is to help the aircraft industry shift from relying solely on gas turbines to using hybrid electric and turboelectric propulsion in order to reduce energy consumption, emissions and noise.
“Aircraft are highly complex machines,” says Jim Heidmann, manager for NASA’s Advanced Air Transport Technology project. “Moving toward alternative systems requires creating new aircraft designs as well as propulsion systems that integrate battery technologies and electromagnetic machines like motors and generators with more efficient engines.”
Glenn researchers are looking at power systems that generate electricity in place of, or in addition to, thrust at the turbine engine and then convert that electricity to be converted into thrust using fans at other places on the aircraft.
“These systems use electric motors and generators that work together with turbine engines to distribute power throughout the aircraft in order to reduce drag for a given amount of fuel burned,” says Amy Jankovsky, subproject lead engineer. “Part of our research is developing the lightweight machinery and electrical systems that will be required to make these systems possible.”
In addition to designing better motors, generators and integrated electrical system architectures, Glenn engineers are also researching the basic materials that go into those components. Research is being performed on the conductors inside, and the insulation around the wires. Along with studying the design of motors and the architecture of power electronics, engineers are improving magnetic materials and semi-conductors to make these motors and electronics lighter and more efficient.
“Our work is laying a foundation for planes that will require less fossil fuel in the future,” says Glenn Engineer Cheryl Bowman, a technical lead on the project. “Considering that the U.S. aviation industry carries over 700 million passengers every year, making each trip more fuel efficient (by up to 30 percent) can have a considerable impact on the nation’s total use of fossil fuels.”
Nancy Smith Kilkenny, ATS
NASA's Glenn Research Center
Category Howto & Style
License Standard YouTube License
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5 Best Personal Aircraft - Passenger Drones and Flying Cars
5 Best Personal Aircraft - Passenger Drones and Flying Cars
https://youtu.be/_dNPjqLyxSI
5 Best Personal Aircraft - Passenger Drones
and Flying Cars
https://youtu.be/_dNPjqLyxSI
Published on Feb 23, 2017
Here is a list of our favorite Personal Aircrafts, Human Flying Machines, Flying Cars and Autonomous Aerial Vehicles (AAV). Some of these are already in the market but some are still prototypes.
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BUY OUR FEATURED DRONES FROM AMAZON
1. Ehang GHOSTDRONE 2.0 Aerial with 4K Sports Camera : http://amzn.to/2mXEOeJ
2. Ehang GHOSTDRONE 2.0 VR, Android Compatible: http://amzn.to/2mtSjF3
3. DJI Inspire 1 PRO Dual, 4K Camera Drone : http://amzn.to/2mY2AHy
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EHANG 184
Introducing ehang 184, a one passenger drone which can carry up to 100kg payload and cruise at a speed of 60 kilometer per hour. The Ehang is an electric AAV (Autonomous Aerial Vehicle) with 25 minutes flight time designed to fly at 3500 meters above sea level making it ideal for medium-short distance transportation.
http://www.ehang.com/ehang184/
Volocopter VC200
The Velocopter VC200 is two-seater electric aircraft that can be operated with a pilot, using remote controls or completely autonomously. With 18 rotors powered by 9 independently batteries the aircraft can go up to 100 km/h. It has a flight altitude of up to 1,980 meters and a maximum take-off weight of 450 kg.
http://www.e-volo.com/index.php/en/vo...
Project Zero
Sized to carry only a single pilot or to be used unmanned, it has around 10 minutes of flight. The company is hoping that within a decade, automakers would have advanced the development of electric batteries to the point that Project Zero will travel for around 100 minutes.
http://www.leonardocompany.com/en/-/p...
Aeromobil 3.0
The Aeromobil 3.0 is two-seater flying car that transforms in seconds from an automobile to an airplane. The vehicle has maximum road speed of 160 km/h and 200 km/h of flight.
http://www.aeromobil.com/
PAL-V Liberty
PAL-V Liberty is a three-wheeler flying car which can reach 100 mph on the ground and can be switched between driving mode and flying mode in 5 to 10 minutes. The Liberty can climb to a maximum altitude of 3500m, and its 197bhp flying engine can propel it up to a top speed of 112miles per hour.
https://www.pal-v.com/en/
HONORABLE MENTIONS
Pop.Up (PopUp)
Pop.Up or PopUp is a convertible passenger capsule that can be attached to either the ground module (electric car) or the air module (a passenger drone). The concept was debuted at 87th Geneva International Motor Show by Airbus and Italdesign Giugiaro. We will talk more about it on the next episode. For now you can read more here: http://www.italdesign.it/project/popup/
Kitty Hawk
The Kitty Hawk Flyer is a new, all-electric aircraft. It is safe, tested and legal to operate in the United States in uncongested areas under the Ultralight category of FAA regulations.
Featured Videos
1. 5 Best Personal Submarines - Luxury Yacht Submarines: https://goo.gl/bhwGgx
2. Best Gaming Laptops 2017 : https://goo.gl/WmhmHm
3. Best Folding Electric Bikes (portable e Bikes) : https://goo.gl/Y8Dttk
4. 4 Best 360 Degree Cameras Available Now : https://goo.gl/Rj5viC
Do you like Audio Books? Join Audible here ( http://amzn.to/2mRhsKK ) and get 2 free audio books.
Website
www.terkrecoms.com
Music
Dance: http://www.bensound.com/
Social
Twitter: https://twitter.com/terkrecoms
Facebook: https://www.facebook.com/terkrecoms
Instagram: https://www.instagram.com/terkrecoms/
Category Science & Technology
License Standard YouTube License
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===================================================
===================================================
https://youtu.be/_dNPjqLyxSI
5 Best Personal Aircraft - Passenger Drones
and Flying Cars
https://youtu.be/_dNPjqLyxSI
Published on Feb 23, 2017
Here is a list of our favorite Personal Aircrafts, Human Flying Machines, Flying Cars and Autonomous Aerial Vehicles (AAV). Some of these are already in the market but some are still prototypes.
***************************************
BUY OUR FEATURED DRONES FROM AMAZON
1. Ehang GHOSTDRONE 2.0 Aerial with 4K Sports Camera : http://amzn.to/2mXEOeJ
2. Ehang GHOSTDRONE 2.0 VR, Android Compatible: http://amzn.to/2mtSjF3
3. DJI Inspire 1 PRO Dual, 4K Camera Drone : http://amzn.to/2mY2AHy
**************************************
EHANG 184
Introducing ehang 184, a one passenger drone which can carry up to 100kg payload and cruise at a speed of 60 kilometer per hour. The Ehang is an electric AAV (Autonomous Aerial Vehicle) with 25 minutes flight time designed to fly at 3500 meters above sea level making it ideal for medium-short distance transportation.
http://www.ehang.com/ehang184/
Volocopter VC200
The Velocopter VC200 is two-seater electric aircraft that can be operated with a pilot, using remote controls or completely autonomously. With 18 rotors powered by 9 independently batteries the aircraft can go up to 100 km/h. It has a flight altitude of up to 1,980 meters and a maximum take-off weight of 450 kg.
http://www.e-volo.com/index.php/en/vo...
Project Zero
Sized to carry only a single pilot or to be used unmanned, it has around 10 minutes of flight. The company is hoping that within a decade, automakers would have advanced the development of electric batteries to the point that Project Zero will travel for around 100 minutes.
http://www.leonardocompany.com/en/-/p...
Aeromobil 3.0
The Aeromobil 3.0 is two-seater flying car that transforms in seconds from an automobile to an airplane. The vehicle has maximum road speed of 160 km/h and 200 km/h of flight.
http://www.aeromobil.com/
PAL-V Liberty
PAL-V Liberty is a three-wheeler flying car which can reach 100 mph on the ground and can be switched between driving mode and flying mode in 5 to 10 minutes. The Liberty can climb to a maximum altitude of 3500m, and its 197bhp flying engine can propel it up to a top speed of 112miles per hour.
https://www.pal-v.com/en/
HONORABLE MENTIONS
Pop.Up (PopUp)
Pop.Up or PopUp is a convertible passenger capsule that can be attached to either the ground module (electric car) or the air module (a passenger drone). The concept was debuted at 87th Geneva International Motor Show by Airbus and Italdesign Giugiaro. We will talk more about it on the next episode. For now you can read more here: http://www.italdesign.it/project/popup/
Kitty Hawk
The Kitty Hawk Flyer is a new, all-electric aircraft. It is safe, tested and legal to operate in the United States in uncongested areas under the Ultralight category of FAA regulations.
Featured Videos
1. 5 Best Personal Submarines - Luxury Yacht Submarines: https://goo.gl/bhwGgx
2. Best Gaming Laptops 2017 : https://goo.gl/WmhmHm
3. Best Folding Electric Bikes (portable e Bikes) : https://goo.gl/Y8Dttk
4. 4 Best 360 Degree Cameras Available Now : https://goo.gl/Rj5viC
Do you like Audio Books? Join Audible here ( http://amzn.to/2mRhsKK ) and get 2 free audio books.
Website
www.terkrecoms.com
Music
Dance: http://www.bensound.com/
Social
Twitter: https://twitter.com/terkrecoms
Facebook: https://www.facebook.com/terkrecoms
Instagram: https://www.instagram.com/terkrecoms/
Category Science & Technology
License Standard YouTube License
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2017年08月19日
The Mariana Trench Mystery | Earth & Universe HD
The Mariana Trench Mystery | Earth & Universe HD
https://youtu.be/JMVXSZUXPf0
The Mariana Trench Mystery | Earth & Universe HD
https://youtu.be/JMVXSZUXPf0
Published on May 9, 2014
Seven miles is a long way down... more than a mile deeper than Mt. Everest is up. To reach the deepest part of the Mariana Trench, James Cameron will descend past some pretty amazing milestones. Here's a glimpse.
Like and Subscribe for more Videos.
Earth & Universe
Category Science & Technology
License Standard YouTube License
NOTE
Mariana Trench : wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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https://youtu.be/JMVXSZUXPf0
The Mariana Trench Mystery | Earth & Universe HD
https://youtu.be/JMVXSZUXPf0
Published on May 9, 2014
Seven miles is a long way down... more than a mile deeper than Mt. Everest is up. To reach the deepest part of the Mariana Trench, James Cameron will descend past some pretty amazing milestones. Here's a glimpse.
Like and Subscribe for more Videos.
Earth & Universe
Category Science & Technology
License Standard YouTube License
NOTE
Mariana Trench : wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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Mariana Trench - Marine Life Undersea Volcanic Hell
Mariana Trench - Marine Life Undersea Volcanic Hell
https://youtu.be/vblLZzw1baE
Mariana Trench - Marine Life Undersea Volcanic
Hell
https://youtu.be/vblLZzw1baE
Published on Nov 27, 2014
Faced with increased acidity, less oxygen and warming temperatures, what does the future hold for the planet's oceans? Bellow the Wave of the Pacific Realm o.
The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islan.
Maug, one of the three islands within the Islands Unit of the Mariana Trench Marine National Monument, is the second northernmost island in the Marianas arch.
Scientists have discovered what they call a lost world more than 2000 metres below the surface in the Southern Ocean, near Antarctica. . Report by Mark Mo.
Category Film & Animation
License Standard YouTube License
NOTE
Mariana Trench : wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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https://youtu.be/vblLZzw1baE
Mariana Trench - Marine Life Undersea Volcanic
Hell
https://youtu.be/vblLZzw1baE
Published on Nov 27, 2014
Faced with increased acidity, less oxygen and warming temperatures, what does the future hold for the planet's oceans? Bellow the Wave of the Pacific Realm o.
The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islan.
Maug, one of the three islands within the Islands Unit of the Mariana Trench Marine National Monument, is the second northernmost island in the Marianas arch.
Scientists have discovered what they call a lost world more than 2000 metres below the surface in the Southern Ocean, near Antarctica. . Report by Mark Mo.
Category Film & Animation
License Standard YouTube License
NOTE
Mariana Trench : wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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Deepest Part of The Oceans - Full Documentary HD
Deepest Part of The Oceans - Full Documentary HD
https://youtu.be/2lNCj1_zZTk
Deepest Part of The Oceans - Full Documentary HD
https://youtu.be/2lNCj1_zZTk
Published on Sep 25, 2016
Measuring the Greatest Ocean Depth
The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters. If Mount Everest, the highest mountain on Earth, were placed at this location it would be covered by over one mile of water.
The first depth measurements in the Mariana Trench were made by the British survey ship HMS Challenger, which was used by the Royal Navy in 1875 to conduct research in the trench. The greatest depth that they recorded at that time was 8,184 meters (26,850 feet).
In 1951, another Royal Navy vessel, also named the "HMS Challenger," returned to the area for additional measurements. They discovered an even deeper location with a depth of 10,900 meters (35,760 feet) determined by echo sounding. The Challenger Deep was named after the Royal Navy vessel that made these measurements.
In 2009, sonar mapping done by researchers aboard the RV Kilo Moana, operated by the University of Hawaii, determined the depth to be 10,971 meters (35,994 feet) with a potential error of ± 22 meters. The most recent measurement, done in 2010, is the 10,994 meter ( ± 40 meter accuracy) depth reported at the top of this article, measured by the United States Center for Coastal & Ocean Mapping.
Category Science & Technology
License Standard YouTube License
NOTE
Reference Link
1.sonar ： wikipedia
https://en.wikipedia.org/wiki/Sonar
2.Mariana Trench： wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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https://youtu.be/2lNCj1_zZTk
Deepest Part of The Oceans - Full Documentary HD
https://youtu.be/2lNCj1_zZTk
Published on Sep 25, 2016
Measuring the Greatest Ocean Depth
The Challenger Deep in the Mariana Trench is the deepest known point in Earth's oceans. In 2010 the United States Center for Coastal & Ocean Mapping measured the depth of the Challenger Deep at 10,994 meters (36,070 feet) below sea level with an estimated vertical accuracy of ± 40 meters. If Mount Everest, the highest mountain on Earth, were placed at this location it would be covered by over one mile of water.
The first depth measurements in the Mariana Trench were made by the British survey ship HMS Challenger, which was used by the Royal Navy in 1875 to conduct research in the trench. The greatest depth that they recorded at that time was 8,184 meters (26,850 feet).
In 1951, another Royal Navy vessel, also named the "HMS Challenger," returned to the area for additional measurements. They discovered an even deeper location with a depth of 10,900 meters (35,760 feet) determined by echo sounding. The Challenger Deep was named after the Royal Navy vessel that made these measurements.
In 2009, sonar mapping done by researchers aboard the RV Kilo Moana, operated by the University of Hawaii, determined the depth to be 10,971 meters (35,994 feet) with a potential error of ± 22 meters. The most recent measurement, done in 2010, is the 10,994 meter ( ± 40 meter accuracy) depth reported at the top of this article, measured by the United States Center for Coastal & Ocean Mapping.
Category Science & Technology
License Standard YouTube License
NOTE
Reference Link
1.sonar ： wikipedia
https://en.wikipedia.org/wiki/Sonar
2.Mariana Trench： wikipedia
https://en.wikipedia.org/wiki/Mariana_Trench
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