[theprincess]

hello everyone
i need some help to understand the first law in thermodynamics especially how to understand reversible and irreversible process and expansion and compression in isothermal,adiabatic .....etc

[hypervalent_iodine]

It would be considerably easier if you could tell us what you do know and what you don't understand, rather than having someone splurge out pages of information.

[CaptainPanic]

I agree with hypervalent_iodine: you ask too much at the same time.

Right now, the best we can do is point at Google and Wikipedia.

[theprincess]

ok thanks to reply actually i cant undersrand how to solve problem and how i will knoe if the process is reversible or not

i didnt get soething useful in google
if any one have lectures notes it will be easier to me to understand
thanks again

[hypervalent_iodine]

It would not be advisable for someone else to end you their lecture notes unless they are already freely available.

A quick Google search gives this:

en.wikipedia.org/wiki/First_law_of_thermodynamics

And if you have access to it:

http://pubs.acs.org/....1021/ed079p193

If you have specific questions, please ask them. You are asking for a lot of information and it's not exactly fair that you ask members here to Google and regurgitate what you could quite easily Google yourself.