We observe that to travel a certain distance with a large speed will take us less time than that same distance at a

small speed.

Density

The term 'density' describes how the mass of a substance relates to its volume and is defined by the equation;

                  Mass

Density = volume

The scientific symbol for density is p (this is the Greek letter rho, which is pronounced as 'row'). Using the scientific symbols for mass (m) and volume (V), we can therefore write the equation

P = m/v

The unit for density is the unit for mass (which is the kilogram) divided by the unit for volume (which is the cubic metre). So, the · unit for density is, which can also be written as kg/m3 or kgm-3

The density of pure water at a temperature of 0 ° C is 1000 kg/m3 or 19/cm3. Pure substances have a fixed density, which remains constant at a particular temperature.

Increasing the mass of the substance will increase its volume in the same proportion.

par Claude Foumtum