What is Diffusion ?
Mixing of two or more substances is called diffusion.
What is Sublimation?
The changing of solid directly into vapour on heating and vapours into solid is known as sublimation.
What is Condensation ?
The process of changing of gas or vapour into a liquid by cooling is called condensation.
Define Vaporisation.
The heating process by which a liquid changes into vapour state is known as vaporisation.
Define Fusion.
The heating of solid into liquid state is known as fusion.
State the three effects of heat on matter.
When a substance is heated, it can cause.. 3. Chemical change. Interconversion of states of matter. Thermal expansion. Chemical change.
Define Brownian movement.
The zig-zag motion of particles is known as Brownian movement.
Define diffusion.
The intermixing of particles of one kind with another kind is known as diffusion.
Define cohesive force.
The force of attraction between the particles of the same substance is known as cohesive force.
Liquids and gases flow but solids do not ?
The molecules of liquids and gases are far apart as compared to solids, hence liquids and gases can flow but solids do not have gaps so they can’t flow.