Formula for...
Density: Mass/Volume
Pressure: Force/Area
Work done: Force(Newtons) x Distance(Metres)= Work done(Joules)
~1ooo Joules= 1kilojoule
~1000 kilojoules= 1 megajoule
~1 kilogram= 10 Newtons
~1 Newton metre= 1 Joule