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Which unit is commonly used to measure heat energy?
A. Calorie
B. Newton
C. Pascal
D. Hertz
Correct Answer Is Option = Calorie
Notes / Explanation
A unit that is commonly used to measure heat energy is the calorie, which is a familiar measure especially in connection with the energy contained in food. Heat is a form of energy, and like all forms of energy it can be measured, and various units have been used for this purpose. The calorie is one of the most widely known of these units, and it is defined in relation to the amount of heat needed to raise the temperature of a certain quantity of water by a certain amount, which gives it a clear physical meaning. The calorie is particularly well known because of its use in describing the energy value of food. The food that people eat provides the body with energy, which it needs in order to carry out all its activities, from moving and working to maintaining the processes that keep the body alive, and the amount of energy provided by different foods is commonly expressed in calories, or more often in larger units equal to a thousand calories. People who wish to manage their diet and their body weight often pay attention to the number of these units that they consume in their food and the number that they use up through activity, because a balance between the energy taken in and the energy used is important for maintaining a healthy weight. In the wider field of science, heat energy, like other forms of energy, may also be measured in another standard unit that is part of the international system of units and that is used for energy of all kinds, and there is a fixed relationship between this standard unit and the calorie, so that one can be converted into the other. The measurement of heat and energy is important in many areas of science and daily life, including the study of how substances are heated and cooled, the working of engines and machines, and the understanding of nutrition. The study of heat and its measurement is part of the branch of science concerned with energy. For PPSC and other competitive examinations, the key points to remember are that a unit commonly used to measure heat energy is the calorie, that it is defined in relation to the heat needed to raise the temperature of water, that it is widely used to express the energy value of food, and that heat energy can also be measured in the standard scientific unit of energy, to which the calorie is related.
