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What is Power per Unit Volume?

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Power per unit volume, sometimes referred to as power density, is the power output for a given volume of a substance or machine. It can also be the amount of power delivered to a unit of volume.

One application of this measurement is in radio communication where a large amount of RF power is concentrated into a volume of the atmosphere to produce an effect called forward scatter.

Power density can also be a measure of the performance or cooling ability of HVAC units, particularly when applied to the design of data centres.

In the design of wind power systems the power density becomes a determinant of what amount of power can be extracted. The concept is also applicable to chemical engineering problems such as the design of stirred tank reactor vessels.

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