A ‘measure of unavailable energy’.Įntropy level higher in Gas: Solid< Liquid< Gas. In other words, if you drop a box of matches on the floor, the matches will fall all over the place, which is an increase in entropy.Įntropy is a ‘measure of disorder’ of a system. Thus increase in entropy implies a transition from one ordered to a less ordered state of affair. When a substance is heated or cooled there is also a change in entropy. The entropy of a substance is a real physical quantity and is a definite function of the state of the body like pressure, temperature, the volume of internal energy. When a gas expands into a vacuum, water flows out of a reservoir, spontaneous chain reaction takes place, an increase in the disorder occurs and therefore entropy increases.Įntropy is the measure of the disorder or randomness in a system.
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