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40 meters – average depth beneath the seabed of the Channel tunnel; 49 meters – wavelength of the broadcast radio shortwave band at 6.1 MHz; 50 meters – length of a road train; 50 meters – height of the Arc de Triomphe; 55 meters – height of the Leaning Tower of Pisa; 62 meters – wingspan of Concorde; 62.5 meters – height of ...
The micrometre (Commonwealth English as used by the International Bureau of Weights and Measures; [1] SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, [2] is a unit of length in the International System of Units (SI) equalling 1 × 10 −6 metre (SI standard prefix "micro-" = 10 −6); that is, one millionth of a metre (or one thousandth of a ...
The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of 10,994 m (36,070 ft) below sea level. Oceanic trenches are a feature of the Earth's distinctive plate tectonics .
In everyday conversation, and in informal literature, it is common to see lengths measured in units of objects of which everyone knows the approximate width. Common examples are: Double-decker bus (9.5–11 meters in length) American football field (100 yards in length) Thickness of a human hair (around 80 micrometers)
Saharan dust particles from a 2005 dust storm event were analyzed, and their diameter ranged from 100 nanometers (1nanometer= 1 x 10 −9 meters) to 50 micrometers (1micrometer= 1 x10 −6 meters). It appeared that most of the particles were coated in sulfates , with the average coating on the silicate particles 60 nanometers thick. [ 3 ]
A depth gauge is an instrument for measuring depth below a vertical reference surface. They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough ...
The average depth of the oceans is about 4 km. More precisely the average depth is 3,688 meters (12,100 ft). [72] Nearly half of the world's marine waters are over 3,000 meters (9,800 ft) deep. [27] "Deep ocean," which is anything below 200 meters (660 ft), covers about 66% of Earth's surface. [87]
The Pacific Ocean's mean depth is 4,000 meters (13,000 feet). [3] The Challenger Deep in the Mariana Trench , located in the northwestern Pacific, is the deepest known point in the world, reaching a depth of 10,928 meters (35,853 feet). [ 4 ]