Inertia.

Inertia,—passiveness or inactivity.

Attraction.

Attraction,—a fundamental law of nature, that every particle of matter has a tendency to be attracted towards another particle.

Density.

Density,—is in proportion to the closeness of the particles to each other.

Volume.

Volume,—the space bounded by the exterior surface of a body, is its apparent volume or size.

Elasticity.

Elasticity,—a body that yields to pressure, and recovers its figure again; hence air and gasses are elastic bodies; lead a non-elastic body.