# PhysicsWatch

#1
Hi, so for isothermal process it says that temperature is constant but why does that mean p x v is constant - I don't really understand what they mean?

I am probs tired :/ But can someone please clear this up for me - will mean a lot

0
3 weeks ago
#2
I think it's as simple as saying pV = nRT, so if T = constant, nRT = constant so pV is a constant.
What course are you doing?
0
#3
(Original post by old_teach)
I think it's as simple as saying pV = nRT, so if T = constant, nRT = constant so pV is a constant.
What course are you doing?
Hi, thanks very much! But wouldn't the moles "n" be able to change? Since R is a constant and T is constant but n is not, so pv is not necessarily constant, no?

This is medical biophysics (first year medic) - apologies haven't done chemistry in a while , hence my stupid question
0
3 weeks ago
#4
No questions are stupid!
n could change, but I think the writer was expecting the gas to be in a sealed container (like a cylinder with moveable piston).
The content feels quite old fashioned to me, so it's interesting what you need to learn to be a medic!
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#5
(Original post by old_teach)
No questions are stupid!
n could change, but I think the writer was expecting the gas to be in a sealed container (like a cylinder with moveable piston).
The content feels quite old fashioned to me, so it's interesting what you need to learn to be a medic!
Ah right! Thank you very much!!

Yes indeed, haha

Apologies for slightly late reply as my internet stopped working
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