Water Pressure gauge

A piston - cylinder device contains 1 kg air at a pressure P = 125 kPa and T= 500K. Now, the gas is started to be heated at constant pressure until its temperature reaches to T = 600 K Calculate the amount of heat delivered to the system in kj during this quasi-equilibrium process. Hint : Air at these conditions can be treated as ideal gas. Answer:

Refrigerant 134a expands in a piston-cylinder assembly from p₁= 200 lb/in² and T₁ = 140°F to p₂ = 30 lb/in² and T₂ = 80 °F. The mass of refrigerant is 0.46 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V₁, in ft³, and the heat transfer for the process, in Btu. Step 1 * Your answer is incorrect. Determine the initial volume of the refrigerant, V₁, in ft³. V₁= 0.105743 ft3

You have 2 kg of saturated steam at P = 2 MPa. How much heat do you have to add to raise the temperature to 600degC if the pressure stays isobaric at 2000 kPa?