Thermal physics

• If a gas Is compressed, work is done ON the gas
• If gas is expanded, work is done BY the gas
• Area under a P-V graph gives work done
• What does the red line stand for?

  isothermal, constant temperature. P1v1 = p2V2

  
• Adiabatic expansion - no heat transfer
• What is the green line showing?

  constant volume, p1/T1 = p2/T2. it is being cooled.

  
• What is the orange line showing?

  Constant pressure. V1/T1 = V2/T2 . Being compressed

  
• Work done = p x change in V