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Specific heat is a measurement used in thermodynamics and calorimetry that states the amount of heat energy necessary to increase the temperature of a given mass of a particular substance by some amount. While different scales of measurement are sometimes used, this term usually specifically refers to the amount required to raise 1 gram of some substance by 1.8°F (1° Celsius). It follows that if twice as much energy is added to a substance, its temperature should increase by twice as much. Specific heat is usually expressed in joules, the unit typically used in chemistry andphysics to describe energy. It is an important factor in science, engineering, and in understanding the Earth’s climate.