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The force that attracts a body towards the centre of the earth, or towards any other physical body having Mass.

The upward force that a Liquid or Gas exerts on a body floating in it.

The occupation by a submerged body or part of a body of a Volume which would otherwise be occupied by a fluid.

Archimedes’ principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the Weight of the fluid that the body displaces and acts in the upward direction at the centre of Mass of the displaced fluid.

The amount of space inside the boundaries of a 2D or 3D object.

Continuous physical force exerted on or against an object by something in contact with it. The force per unit Area exerted by a fluid against a surface with which it is in contact.

A body’s relative Mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing.   The force exerted on the Mass of a body by a gravitational field.

An air-like fluid substance which expands freely to fill any space available, irrespective of its quantity.

When something becomes incorporated into a Liquid so as to form a solution.

A thin sphere of Liquid enclosing air or another Gas.