Weight in this context is a colloquial term for mass. The power-to-weight ratio (specific power) formula for an engine (power plant) is the power generated by the engine divided by the mass. 2.4.2.3 Performance luxury, roadsters and mild sports.2.2.3 Fuel cell stacks and flow cell batteries.

2.2.2 Electrostatic, electrolytic and electrochemical capacitors.2.2 Electrochemical (galvanic) and electrostatic cell systems.2.1.4 Thermoelectric generators and electrothermal actuators.2.1.2 Electric motors and electromotive generators.Power-to-weight ratio is equal to thrust per unit mass multiplied by the velocity of any vehicle. The inverse of power-to-weight, weight-to-power ratio (power loading) is a calculation commonly applied to aircraft, cars, and vehicles in general, to enable the comparison of one vehicle's performance to another. Power-to-weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight (or mass) of the vehicle, to give a metric that is independent of the vehicle's size. Power-to-weight ratio is a measurement of actual performance of any engine or power source. Power-to-weight ratio ( PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another.

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