Thermodynamics is the study of heat (heat) that move. In thermodynamics you will a great deal about the system and the environment. Collection of objects called the system under review, while all who were around (outside) the system is called the environment.
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Outside of business done by the system, if heat is added (heated) or heat reduced (cooled) to the system. If heat is applied to the gases that cause changes in the volume of gas, out of business will be done by the gas. The work done by the gas when the volume change of the initial volume V1 to V2 in the final volume constant pressure p is expressed as the product of pressure with volume changes.
W = pΔV = P (V2 - V1)
In general, businesses can be expressed as an integral pressure against volume changes are written as
Pressure and volume can be plotted in the graph p - V. if changes in pressure and gas volume is expressed in graphical form p - V, gas work done is the area under the graph p - V. this corresponds to the integral operation is equivalent to the area below the graph.
The gas is said to do business if the volume of gas becomes larger (or expand) and V2> V1. otherwise, the gas is said to receive a business (or business done on the gas) when the gas volume decreases or V2
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