CH 3 MATTER

Gas

water is a matter because it ocuppy space and has mass.

At atmospheric pressure the temperature at which a liquid boils and changes rapidly into a gas is called boiling point.

At one atmospheric pressure the temperature at which a solid sustances melts and changes into a liquid is called melting point.

Mixing of two or more substances is called diffusion.

The changing of solid directly into vapour on heating and vapours into solid is known as sublimation.

The process of changing of gas or vapour into a liquid by cooling is called condensation.

The heating process by which a liquid changes into vapour state is known as vaporisation.

The heating of solid into liquid state is known as fusion.

When a substance is heated, it can cause.. 3. Chemical change. Interconversion of states of matter. Thermal expansion. Chemical change.