因1t=1000kg=1*10^3kg,1kg=1000g=1*10^3g,1m^3=10^3dm^3,1dm^3=1*10^3cm^3
故 1g/cm^3=1kg/dm^3=1*10^3kg/m^3=1t/m^3
因1km=1000m,1h=3600s
故 1m/s=3600*1m/(3600*1s)=3600m/h=3.6km/h
1km/h=(1/3.6)m/s
因1t=1000kg=1*10^3kg,1kg=1000g=1*10^3g,1m^3=10^3dm^3,1dm^3=1*10^3cm^3
故 1g/cm^3=1kg/dm^3=1*10^3kg/m^3=1t/m^3
因1km=1000m,1h=3600s
故 1m/s=3600*1m/(3600*1s)=3600m/h=3.6km/h
1km/h=(1/3.6)m/s