s are often compared using a specific power measuring watts per Square Metre of turbine disk area ( Pi times the length of a blade squared). This measure is also commonly used for Solar Panel s, at least for typical applications.
, specific power is typically quoted in Horsepower per Cubic Inch of Displacement , or alternately Kilowatt s per Litre . The result offers a general idea of the engine's ability to efficiently extract power from its Fuel . A modern high-performance car engine makes in excess of 1.65 hp/in³ (75 kW/L).
Mass: When comparing Batteries , specific power refers to the Power-to-weight Ratio , measured in kilowatts per Kilogram . Various fuels are often measured the same way. This is also used as an alternate measure for solar panels, notably those used in space applications where weight is key.
