Well, you seem like a very smart kid. Let me ask you something: if you had one pound of naiveness in one hand and one pound of idiocy in the other, which one weighs more? Let me tell you a secret: Its the same!
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It depends on volume of the container and the temperature of the steam, the pressure, volume and temperature of a gas are related by the _ideal gas law_:
(where N is the number of particles in the gas, and k is a constant depending on the particular properties of the gas).
About 1,600 BTUs of heat energy are needed to turn a pound of water into steam. This corresponds to around 0.1 pounds of water needed to produce one pound of steam.
Assuming the law of conservation of mass holds true, you could get 1 pound of steam from 1 pound of water.
No, steam and water have different properties. Steam is a gas, while water is a liquid. 10 pounds of steam will not push solid water in a pipe because they are different states of matter and do not interact in the same way.
1 pound of air is equal to approximately 0.08 pounds of water. This is because air is much less dense than water, with air having a density of about 0.075 pounds per cubic foot and water having a density of 62.4 pounds per cubic foot.
There are approximately 2 pints in 1 pound of water, so 1.5 pounds of water would be roughly 3 pints.
A pint of water weighs a pound and a quarter (20 ounces).
400 pounds of plain water is about 48 gallons.