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For most materials and substances, and not allowing other parameters to change (like temperature), the density goes up as pressure increases.

One way to look at is like this:
Suppose a balloon is filled with air -- and sealed. Dunk it under water, which squeezes it harder, thus decreasing the volume.
The total mass is the same.
Density = mass / volume.
Since volume has gone down, density has gone up.


Another way.
Put more air in the balloon, but instead of a balloon, it has a rigid inflexible wall. Now the volume has not changed, but the mass is higher (since you increased the amount of air).
So the density is higher (see above).
But what happened to the rigid walls of the balloon. The air pushes harder on them!
So increased density causes higher pressure, and higher pressure causes increased density.

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15y ago

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