Speed
Distance / time
Km/h or m/s
Density
Mass / volume
Kg/m^3 or g/cm^3
Pressure
Force / area
N/m^2
1m^2 in cm^2
10 000
1m^3 in cm^3
1 000 000
Convert m/s into km/h
x 60 sec to min
x 60 min to hour
Divide by 1000 m to km
convert km/h into m/s
divide by 60 hour to min
divide by 60 min to sec
x 1000 km to m