Air at 30°C is contained in a piston-cylinder assembly, as shown in the figure. The piston has a weight of 15N and a cross-sectional area of 0.12 m2. The initial volume of air is 3.5 m3. Heat is added until the volume of the air becomes 6.5 m3. Atmospheric pressure is 100 kPa. a. Find the final air temperature. b. Determine the work done by the air on both the piston and the atmosphere. c. Find the change in the internal energy of the air in the cylinder, and the heat exchanged with the surroundings.

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.