UPSC 2003: Consider the following statements: 1. Steam at 100 °C and boiling water at 100 °C contain the same amount of heat. 2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water. 3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils. Which of these statements is/are correct?

1 is false because steam at 100 °C contains the latent heat of vaporization and therefore has much more energy than boiling water at the same temperature. 2 is false—the latent heat of fusion of ice is about 334 kJ kg⁻¹, whereas the latent heat of vaporization of water is about 2 260 kJ kg⁻¹. 3 correctly describes an air-conditioner cycle: the indoor evaporator coil absorbs room heat and the outdoor condenser coil rejects it. Hence only statement 3 is correct. ([britannica.com](https://www.britannica.com/science/latent-heat?utm_source=openai))