EVERYDAY SCIENCE

Detailed explanation-1: -Condensation of water vapor to liquid water releases 2260 joules of energy per gram of water. This heats the atmosphere.

Detailed explanation-2: -Water, for example, with one oxygen and two hydrogen atoms, can form two hydrogen bonds per molecule. Its heat of evaporation is 2, 260 joules per gram, or 541 calories per gram, and it starts boiling at 100 degrees Celsius (212 degrees Fahrenheit).

Detailed explanation-3: -The heat of vaporization of water is about 2, 260 kJ/kg, which is equal to 40.8 kJ/mol. The vaporization is the opposite process of condensation. The heat of condensation is defined as the heat released when one mole of the substance condenses at its boiling point under standard pressure.

Detailed explanation-4: -A total of 334 J of energy are required to melt 1 g of ice at 0°C, which is called the latent heat of melting. At 0°C, liquid water has 334 J g−1 more energy than ice at the same temperature. This energy is released when the liquid water subsequently freezes, and it is called the latent heat of fusion.

Detailed explanation-5: -The heat of vaporization of water at 100 ºC is 2260 J/g.