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Climbing Mount Rainier.. The effects of high altitude on humans are mostly the consequences of reduced partial pressure of oxygen in the atmosphere. The medical problems that are direct consequence of high altitude are caused by the low inspired partial pressure of oxygen, which is caused by the reduced atmospheric pressure, and the constant gas fraction of oxygen in atmospheric air over the ...
The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres ( 1 100 m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.
An early definition of the metre was one ten-millionth of the Earth quadrant, the distance from the North Pole to the Equator, measured along a meridian through Paris.. The history of the metre starts with the Scientific Revolution that is considered to have begun with Nicolaus Copernicus's publication of De revolutionibus orbium coelestium in 1543.
Deep diving. Scuba diver using a rebreather with open circuit bailout cylinders returning from a 600-foot (180 m) dive. Deep diving is underwater diving to a depth beyond the norm accepted by the associated community. In some cases this is a prescribed limit established by an authority, while in others it is associated with a level of ...
64 [2][3] The Thirty Meter Telescope (TMT) protests are a series of protests and demonstrations that began on the Island of Hawaii over the choosing of Mauna Kea for the site location of the Thirty Meter Telescope. Mauna Kea is the most sacred dormant volcano of Native Hawaiian religion and culture, and was known to natives as the home to ...
30.48 cm = 3.048 dm — 1 foot. 30 cm = 3 dm — typical school-use ruler length (= 300 mm) 60 cm = 6 dm — standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm) 90 cm = 9 dm — average length of a rapier, a fencing sword [ 35 ] 91.44 cm = 9.144 dm — one yard. Cigarettes 100 mm (4 in) in length.
Thirty Meter Telescope. The Thirty Meter Telescope (TMT) is a planned extremely large telescope (ELT) [5][6][7] proposed to be built on Mauna Kea, on the island of Hawai'i. The TMT would become the largest visible-light telescope on Mauna Kea. [8][9] Scientists have been considering ELTs since the mid 1980s. In 2000, astronomers considered the ...
The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth circumference is very near 21 600 nmi. A minute of arc is π 10 800 of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [2] is 1 60 of an arcminute, 1 3600 ...