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It depends on the size of the container holding the air. If a container is bigger, it

will need more air to reach 150 psi. If a container is smaller, it will need less air to

reach 150 psi.

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HONK ! Beulah the buzzer is upset with that concept.

Put any amount of air you want into the container, and seal her up good and tight.

No matter how much or how little air is in there, and no matter what the inside

volume of the container is, I can bring it to 150 psi, or to any other pressure you

choose, by adjusting the temperature of the container and its contents. You want

more pressure ? Just heat the container. You want less pressure ? Just cool it and

the pressure will drop until the air inside freezes. Works with any gas.

If you want to know the weight of a sample of air, you have to specify the mass.

If you don't know the mass, then we need the pressure and the temperature.

Lacking either of those figures, the weight could be anything.

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