# Gas law

1. Nov 4, 2011

### nafo man

1. The problem statement, all variables and given/known data

what is the type of law that applies for this change?

2. Relevant equations
Isobaric,Isochoric ,Isothermal

3. The attempt at a solution
the parameters which stays constant during the change for isobaric is pressure and its a first law of thermodynamic.for isochoric is volume and again its a first law of thermodynamic,and for isothermal temperature remains constant and its a adiabatic law,but what expression during these changes stays constant?what would be different in term of parameter v expression .

2. Nov 5, 2011

### Simon Bridge

For what change?

For all of them? Total energy?

3. Nov 5, 2011

### nafo man

type of law applies to :isobaric,isochoric,isothermal ?
what parameter stays constant during isobaric,isochoric,isothermal?
what Expressions stays constant during isobaric,isochoric,isothermal?

4. Nov 5, 2011

### Simon Bridge

Not sure what "type of law" means here - I'm guessing it would be an answer like "Boyle's Law" etc.

Parameter of each - you have it right: to check, just google the terms.
"iso" is like "isolate"
thermal = temperature
baric = pressure
choric = volume (not obvious but there's only one left)

note: "adiabatic" is another process where the internal energy is unchanged

expressions to choose from would be those for:
total energy
internal energy
entropy
work
... that kind of thing

so for isothermal:
1. Boyle's Law
2. Constant temperature
3. PV=const, W=0 (const)

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