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imscavok
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Homework Statement
A parcel of dry air is lifted isothermally such that its pressure decreases from 1000 hPa to 850 hPa. Calculate the change in specific entropy of the parcel.
Homework Equations
ΔS=n*R*ln(p1/p2)
The Attempt at a Solution
Using R=8.314 J/mol K
p1=1000hPa
p2=850hPa
And assuming n=1
ΔS=1.35J/K
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The problem is that's just the change in entropy. I need the change in specific entropy, which units are in J/g*K.
The problem gives no information on the amount of mass within the parcel. Even if I had the mass, I'm not sure how I would find the specific entropy with it. What am I missing?
edit: Nevermind. R is specific for dry air which is R=287 J/kg*K
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