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Specific gravity is identical to density.

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Both liquids and gases are fluids.

Newton's second law state that an object remains at rest or remains in constant motion unless it is subject by an unbalanced force

The density of a fluid, designated by the Greek symbol (𝜌 rho), is defined as its mass per unit volume.

Gases (air, oxygen, etc.) have even greater molecular spacing and freedom of motion with negligible cohesive intermolecular forces consequence are easily deformed (and compressed) and will completely fill the volume of any container in which they are placed