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1.6 × 10 −5 quectometers (1.6 × 10 −35 meters) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.) 1 qm – 1 quectometer, the smallest named subdivision of the meter in the SI base unit of length, one nonillionth of a meter.
However, Joseph Kittinger still holds the record for longest-duration free fall, at 4 minutes and 36 seconds, which he accomplished during his 1960 jump from 102,800 feet (31.3 km). Higher jumps from the mesosphere or thermosphere have yet to be successfully performed, though Orbital Outfitters, [ 3 ] now defunct, was working to create a suit ...
A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
A study published in 2009 in the journal Aviation, Space and Environmental Medicine campared ascent rates of 30 feet per minute and 60 feet per minute in recreational divers. The group using the faster ascent rate had higher bubble grades after the dive measured ultrasonically, which supports the hypothesis that slower ascents reduce ...
The US Navy air decompression tables allow flying with a cabin altitude of 8000 feet for repetitive group C, which results from a bottom time of 61 to 88 minutes at a depth of 15 feet (4.6 m), or a bottom time of 102 to 158 minutes at a depth of 10 feet (3.0 m).
A descent of 10 metres (33 feet) in water increases the ambient pressure by an amount approximately equal to the pressure of the atmosphere at sea level. So, a descent from the surface to 10 metres (33 feet) underwater results in a doubling of the pressure on the diver. This pressure change will reduce the volume of a gas filled space by half.
Scientists have discovered a mysterious pulsating light—and they don’t know what it could be. It pulses at a rate of about once every 21 minutes, and has been doing so since at least 1988.
At altitude 3,000 feet (910 m), P 1 = 0.7 bar (approximatelty), and at a depth of 10 m, P 2 = 1.7 bar, so V 2 /V 1 = 0.7/1.7 = 0.412 As a consequence, dry suit squeeze , mask squeeze , and ear and sinus squeezes will all develop more rapidly at higher altitude.