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# Ratio question: gas laws

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1. see attachment for Q:

I have added all relevant information including MS answer....I just wanted to check why they are correct....is it because pV=constant (at a constant temperature - this was an assumption we were told to make).
As L (length) is a proportional to volume we can say P*L = constant

is this correct?
Attached Thumbnails

2. Yes, because volume is L x cross section (A) and the cross section is the same.
If pV is constant then
pLA = constant

If A is constant
pL = (a different) constant
3. (Original post by Stonebridge)
Yes, because volume is L x cross section (A) and the cross section is the same.
If pV is constant then
pLA = constant

If A is constant
pL = (a different) constant
thats a really good way to see it (using A)

thanks

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