“A branch of science which deals with study of composition, properties, structure and chemical changes with their causes in matter is called “CHEMISTRY.”
Anything which occupies space and has weight is called matter. Matter can be divided into three different states i.e. solids, liquids and gases.
All those substance having definite shape and volume are classified as solid. These are not compressible.
A liquid has a definite volume but indefinite shape; it takes the shape of its container.
All those substance having indefinite volume and indefinite shape are termed as Gas. It can be easily compressed or squeezed.