The document discusses the first law of thermodynamics and different thermodynamic processes. The first law states that the energy put into a system equals the sum of the work done by the system and the change in internal energy. An isothermal process occurs at constant temperature, with heat equal to work. An adiabatic process involves no heat transfer, so a change in internal energy is equal and opposite to work, causing temperature to increase or decrease depending on the work's direction.

1. Thermodynamics
Processes

2. First law of thermodynamics is a statement of
conservation of energy stated as
“The energy put into the system equals the sum of
the work done by the system and the change in
internal energy of the system”
Q=ΔU+W
• Q is positive when given to the system
• Q is negative when taken from the system
• W is positive if it is done by the system
• W is negative if it is done on the system
First Law of Thermodynamics

3. Thermodynamic Process followed at constant
temperature
1) PV= constant
2)ΔU=0
3) ΔQ =ΔW
Isothermal Process

4. Adiabatic Process
Process in which no heat enters or leaves a system is
called an adiabatic process
1) ΔU=U2 – U1= - ΔW
2) ΔW > 0, ΔU < 0 and
Temperature of the system decreases
3) ΔW < 0, ΔU > 0 and Temperature of the system
increases

5. For more tips and study
material please visit our
website
http://physicscatalyst.com