Wednesday, May 30, 2012

Gas Laws Help

The three gas laws are Charles Law, Boyle's Law and Gay-Lussac's Law. This is the clearest statement of it I've found and yes, if you look, it's from Wikipedia (don't listen to your teachers when they tell you Wikipedia is terrible. Mostly it's amazingCharles's law states that volume and temperature are directly proportional to each other as long as pressure is held constant. Boyle's law asserts that pressure and volume are inversely proportional to each other at fixed temperature. Finally, Gay-Lussac's law introduces a direct proportionality between temperature and pressure as long as it is at a constant volume. The inter-dependence of these variables is shown in the combined gas law, which clearly states that:
The ratio between the pressure-volume product and the temperature of a system remains constant.
Pressure and temperature, at a fixed volume, are proportional, so that if the temperature goes up, as in the experiment Tala and I were doing at the front of the class (#3), then the pressure goes up. If you graph them it should be a straight line.

Volume and Temperature, as we saw when we dunked the syringe in water, are also proportional. As temperature goes up, you volume also wants to increase. As the one goes up, the other goes up proportionally i.e. in a straight line.

Volume and Pressure: These two are inversely proportional As we increased pressure (added books) we saw the volume decrease. It decreased a lot when you put the first book on it, and decreased increasingly less per book as the number of books increased. So as pressure goes up, volume goes closer to zero.

If there are more questions, post below. I'll be checking frequently for the next couple hours. Remember, if you want me to look at it, I need to have your write up in tomorrow!

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