Archimede`s Law

When objects are dipped in water, they move aside (displace) some water. This is how they make room for themselves.

The volume of water displaced = the volume of the object

This volume of water weighs some amount. To calculate the weight we use the equation for density: m=dv

Archimede`s discovered that water produces a force upwards on object submerged in it. The strength of that upwards force is related to the weight of the water that the object displaces.

An object will sink if the weight of the object (W=mg) is greater than the upward word (weight of the water displaced).