Submerged Balloons
Because of the enormous density difference between water and gases (water is about 1,000 times more dense than most gases), the lifting power of underwater gases is very strong. The type of gas used is largely inconsequential because the relative differences between gases is negligible in relation to the density of water. However, some gases can liquefy under high pressure, leading to an abrupt loss of buoyancy.
A submerged balloon that rises will expand or even explode because of the strong pressure reduction, unless gas is able to escape continuously during the ascent or the balloon is strong enough to withstand the change in pressure.
Read more about this topic: Lifting Gas
Famous quotes containing the words submerged and/or balloons:
“Yet it is in our idleness, in our dreams, that the submerged truth sometimes comes to the top.”
—Virginia Woolf (1882–1941)
“Canaries in the morning, orchestras
In the afternoon, balloons at night. That is
A difference, at least from nightingales,
Jehovah and the great sea-worm.”
—Wallace Stevens (1879–1955)