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1. Guys how is the ideal gas equation a thing when each individual equation that's combined has it's own rules.
For example: Pressure is inversely proportional to volume at constant temperature. Then pressure is directly proportional to temperature when volume is constant.

How can you combine these things when the conditions aren't the same for each equation. The Pressure law states that volume is constant and Boyles law states that temperature is constant.
There are different conditions because volume isn't constant for Boyles law. I don't get how you can combine them if they aren't true for each others conditions. Can anyone help?
2. The ideal gas law is:
pV=nRT
where n and R are constants for a closed system of gas
so

pV is proportional to T.
if you make any of these constant then the equation can be rearranged to:
p inversely proportional to V
p proportional to T
V is proportional to T

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