ABSTRACT
The measurement process involves first identifying the attribute to be measured and then selecting a unit against which the attribute can be compared, example, a metre, a litre or a kilogram. A fundamental principle of measurement is that attributes can never be determined with complete accuracy. The required level of accuracy of a particular measurement often depends on the purpose for its use. Area quantifies the size of a two-dimensional surface. Volume is measured in cubic kilometres, cubic metres and cubic centimetres. Mass is often confused with weight, which is the force which gravity exerts on the object. Mass is measured in tonnes, kilograms, grams and milligrams. Time is measured using a wide variety of devices and expressed in a multitude of units. Temperature is measured in degrees Celsius. Angles are measures of the amount of turn and are measured in degrees.
