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The BTU or Btu is a heat; it’s known as the heat needed to increase the temperature by one-degree Fahrenheit by one pound of water. It also belongs to customary units of the United States. The calorie, the quantity of heat needed to increase 1-gram water temperature by 1 degree Celsius, is equivalent to the metric system. Heat is also considered to be the energy equivalent, with the player being the SI unit. Though heat units are mostly replaced in science work by energy units, they still are used in some areas. In the United States, for example, petrol costs per million BTUs in dollars are quoted.