"Then why do you feel weightless underwater? Well, let's back up for a moment. Imagine you have a block of steel and a block of styrofoam, both measuring 1 cubic foot in volume. Each one has a mass, which equals its volume ( V) times its density ( ρ). Then the gravitational force ( Fg) on each is simply mass times the gravitational field ( g):"
"But you already know about this, because Fg is what normies call an object's "weight," and for a given volume, weight depends only on the density. Now, if you dropped these blocks in a lake, obviously the styrofoam would float and the steel would sink. So clearly it has something to do with density. What if you had a block of water with the same volume? If you could somehow hold this cube of water, it would feel pretty heavy, about 62.4 pounds."
An inverted dinghy can form an air pocket underwater, but pressure increases with depth compress the trapped air and reduce usable volume. The dinghy and trapped air experience a large upward buoyant force equal to the weight of displaced water, so the boat must be heavily weighted or securely anchored to remain submerged. Breathing inside the pocket consumes oxygen and raises carbon dioxide quickly, creating a hazardous environment even if oxygen remains. Imperfect seals and leaks slowly replace air with water. Practical survival time in such a pocket is short and depends on depth, pocket size, and methods to control buoyancy and CO2.
Read at WIRED
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