Comment upon the following:rigidity, compressibility,fluidity, filling a gascontainer, shape, kineticenergy and density

Rigidity: This refers to the inability of a substance to change its shape or volume under normal conditions. Solids are usually rigid because their particles are closely packed and can only vibrate about their fixed positions.

Compressibility: This is the ability of a substance to decrease in volume when pressure is applied. Gases are highly compressible because their particles are far apart and can be pushed closer together.

Fluidity: This is the ability of a substance to flow or change shape easily. Liquids and gases are fluid because their particles can move past each other.

Filling a gas container: Gases have the ability to fill any container in which they are placed. This is because gas particles are in constant, random motion and will spread out to fill the available space.

Shape: The shape of a substance depends on the arrangement of its particles. Solids have a definite shape because their particles are tightly packed in a fixed arrangement. Liquids take the shape of their container because their particles can move past each other. Gases have no definite shape because their particles are far apart and move freely.

Kinetic Energy: This is the energy of motion. The kinetic energy of a substance's particles increases with temperature. In a gas, the particles have the highest kinetic energy because they move the fastest and in all directions.

Density: This is the mass of a substance divided by its volume. Solids are usually denser than liquids, and liquids are denser than gases. This is because the particles in solids and liquids are closer together than in gases.