Compressible Fluids and Objects
The atmosphere's density depends upon altitude. As an airship rises in the atmosphere, its buoyancy decreases as the density of the surrounding air decreases. In contrast, as a submarine expels water from its buoyancy tanks, it rises because its volume is constant (the volume of water it displaces if it is fully submerged) while its mass is decreased.
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Famous quotes containing the word objects:
“But after the intimacy-inducing rituals of puberty, boys who would be men are told we must go it alone, we must achieve our heroism as the Lone Ranger, we must see the other men as threats to our masculine mastery, as objects of competition.”
—Frank Pittman (20th century)
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