'under water'

@shilpa28k (1737)
India
December 15, 2006 4:30am CST
"What do you mean 'under water'?"?
2 people like this
4 responses
bacedone
@bacedone (430)
• Italy
15 Dec 06
sotto l'acqua !...in italian
1 person likes this
prasad1961
@prasad1961 (5597)
• India
15 Dec 06
Under water - At depths greater than a few hundred meters, the sun has little effect on water temperature, because the sun's energy has been absorbed by water at the surface. In the great depths of the ocean the water temperature is very cold. In fact, 75% of the water in the world ocean (the great depths) has a temperature between 0 °C and 2 °C.
An immediate obstacle to human activity under water is the fact that human lungs cannot naturally function in this environment. Unlike the gills of fish, human lungs are adapted to the exchange of gases at atmospheric pressure, not liquids. Aside from simply having insufficient musculature to rapidly move water in and out of the lungs, a more significant problem for all air breathing animals, such as mammals and birds, is that water contains so little dissolved oxygen compared with atmospheric air.
september_1st
@september_1st (3209)
• Romania
15 Dec 06
Bellow the surface of water.
edelweiss
@edelweiss (1929)
• India
15 Dec 06
Haha.. Am glad you brought this to my notice. I never really thought about this term. :) Technically, if not literally, it means to be under the surface of water.