How do you change an object's density?

Answer 1

You have two choices:

-- Somehow increase or decrease its mass without changing its volume.

This is quite difficult.

-- Somehow either expand it into a greater volume or squeeze it into a

smaller one, without changing its mass in either case. This is easy to do

if the object happens to be a sample of a gas.

Answer 2

To change an object's density, you can change either its mass or volume. Increasing the mass or decreasing the volume will increase the density, while decreasing the mass or increasing the volume will decrease the density.

Answer 3

By changing the temperature either by heating or cooling