1. Hi,

studying an old text by one C J Hall

any help with this derivation would be most appreciated

"
From Pv^n =C ....

(P^(1/n))(T/P) = C
or
TP^((1-n)/n)
"
P=Pressure
v=Volume
T=Temperature
n is a characteristic of the process

Cheers

2.

3. Uh ... no,
n is a characteristis of the process, for example n = 1.4 for a reversible adiabatic process

4. Originally Posted by vette72
Uh ... no,
n is a characteristis of the process, for example n = 1.4 for a reversible adiabatic process
I therefore suspect that you are in fact dealing with an isentropic process in which case what you are calling "n" is the ratio of specific heats. That quantity depends on the gas but is 1.4 for a diatomic gas.

http://en.wikipedia.org/wiki/Heat_capacity_ratio

5. In the specific case of n=1.4 we are definately dealing with an isentropic process.

Returning to the original question which was the derivation of another formula from PV^n=C.

"
From Pv^n =C ....

(P^(1/n))(T/P) = C

or

TP^((1-n)/n) = C
"

I do not think the value of n will affect the derivation of the formula.

6. Originally Posted by vette72
In the specific case of n=1.4 we are definately dealing with an isentropic process.

Returning to the original question which was the derivation of another formula from PV^n=C.

"
From Pv^n =C ....

(P^(1/n))(T/P) = C

or

TP^((1-n)/n) = C
"

I do not think the value of n will affect the derivation of the formula.
for an isentropic gas expansion (or compression). See the links in my post above. The fact that for a diatomic gas is not relevant.

 Bookmarks
##### Bookmarks
 Posting Permissions
 You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are On Terms of Use Agreement