Consider a device similar to that used by Joule to measure the net work between two states as depicted in the follow diagram. The mass of the weight connected by a string to the winding drum is 4 kg. If upon release, the mass falls 0.8 meters, by how many joule does the internal energy of the water change? Is the rise in the internal energy of the water due to work or heat being added to the system?

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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.