Lol your in my science class. i believe its plutonium-239, but if someone else says I'm wrong listen to them. I'm not too sure.
The air pressure is a measure of the pressure of the air. The vapour pressure of a liquid, say, water, is a function of its temperature and does not depend on the air pressure. ... Its vapour pressure is higher than atmospheric pressure so its temperature is higher than the boiling point of water.
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