How dense?

A cubic meter (m3) of pure water weighs 1,000 kg or one tone. Materials that have a density that is greater than water Sink, and those that are less dense float. Lightweight metals such as aluminium and titanium are important to engineers – for example, for building aircraft that need to be strong but enough to fly. These are the average densities of some of the substances around us. It is defined as a materials mass per unit volume. Its symbol is the Greek letter ‘rho’. It is defined mathematically as

p=m/v

where:

p (rho) is the density,

m is the mass,

V is the volume. Habitually, different materials have different densities. With regarding buoyancy, metal purity and packing the density is considered an important thing. it is expressed as the dimensionless quantities specific gravity or relative density. It is usually expressed in multiplies of the density usually water or air.