1kg force m/s (kgf m/s) = 9.80665 watts (w)
1 metric horsepower (hp) = 735.499 watts (W)
1 cal/s (cal/ s) = 4.1868 watts (W) 1 British thermal unit/hour (Btu/h) = 0.293071 watts (W)
1 kilowatt (kW) = 3.6×10^6 joules (J)/hour（h)