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High Quality Content by WIKIPEDIA articles! The power number Np (also known as Newton number) is a commonly-used dimensionless number relating the resistance force to the inertia force. In physics, power is the rate at which work is performed or energy is converted. It is an energy per unit of time. The average power (often simply called "power" when the context makes it clear) is the average amount of work done or energy converted per unit time. The instantaneous power is then the limiting value of the average power as the time interval ?t approaches zero.

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High Quality Content by WIKIPEDIA articles! The power number Np (also known as Newton number) is a commonly-used dimensionless number relating the resistance force to the inertia force. In physics, power is the rate at which work is performed or energy is converted. It is an energy per unit of time. The average power (often simply called "power" when the context makes it clear) is the average amount of work done or energy converted per unit time. The instantaneous power is then the limiting value of the average power as the time interval ?t approaches zero.