1 Btu is approximately equal to how many kilojoules?

The value of 1 British Thermal Unit (Btu) is approximately equal to 3.6 kilojoules. This conversion is based on the relationship between these two units of energy, where 1 Btu is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit, which equates to about 3.6 kilojoules in metric terms. Understanding this conversion is crucial when working with energy calculations in fire service contexts, such as determining heat release rates or understanding fire behavior in different materials. This knowledge helps in making informed decisions during firefighting operations and when assessing the impact of heat on various structures.