Water has a specific heat capacity of around 4.2 J/g°C. As a result, raising 1 gram of water by 1°C requires 4.2 joules of energy. The heat required to increase the temperature of a particular substance's unit mass by a certain quantity is referred to as its specific heat capacity. The term specific heat may also refer to the ratio between the specific heat capacities of a substance at a given temperature and of a reference substance at a reference temperature, such as water at 15 °C; [5] much in the fashion of specific gravity. Learn what specific heat of water is, how it is calculated and why it is higher than most substances. Find out the specific heat of water as a liquid and a vapour, and how it relates to heat capacity and temperature. Specific heat of water refers to the amount of heat energy required to raise the temperature of one gram of water by one degree Celsius (1°C). This important concept is widely used in heat capacity studies, calorimetry experiments, and thermodynamic calculations.