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Posts by Pendulum

Quote: Originally Posted by DWFII ^ Thank you. I'll have to think about this. I keep coming back tot the idea of water molecules displacing air molecules in any volume of air. Tell me when I misstep... If we have two balloons one filled with nothing but air and the other with 5% water. which will be heavier/denser? No, I'm not arguing--henceforth I'll tell people/assume that moist air is lighter than dry air...but I just can't seem to get my head...
Quote: Originally Posted by Nicola Think of compressed gas. In it's heavily compressed form you have lots of gas in a small space. Now release the pressure and it goes flying around. If it gets cold enough oxygen does become a liquid. If water gets hot enough it turns to a gas (aka steam). In it's gas form you'll notice it rises. Although the reason the gas form of water rises is due to the temperature difference. PV=nRT therefore per unit...
Quote: Originally Posted by DWFII I have no credentials or expertise to question you but perhaps you could clarify by answering a few of my lingering doubts... Is oxygen heavier than water? If so, why does water pool and oxygen "float"? Oxygen, by its molecular weight is heavier than water, but that's neither here nor there. Water is liquid at room temperature, whereas pure oxygen is gas which means that water is far more dense than oxygen at...
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