(see Mapping)

Agreement between parties enforceable in law.

A decrease in size. For example, when a metal rod is cooled it decreases in length and diameter. Opposite of expansion.

A flap that is used to control something! Air temperature for example.

Part of fuel injection system. Regulates fuel delivery against air flow.

A pump that provides a set pressure.

Travel of heat by movement in heated fluids due to a reduction in density and consequent rise of the hotter material.

Conversion coatings are used on metal parts (such as vehicle bodies) to be painted. They are acidic chemical products used before paint to convert the metal substrate to an iron or zinc phosphate surface. The chemical reaction modifies the metal surface to enhance paint adhesion and corrosion protection

Used to make it easier when converting from one form of ‘measurement' to another.

To change one expression to another. For example, expressing miles in kilometres.