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An agreed standard used to express the measurement of a physical quantity.

A measurement needs both a numerical value and a unit: “20” alone is incomplete, whereas 20 s is a time measured in seconds.

A standard used to express a measurement, such as the second for time or the metre for length.

Write the unit with every numerical answer unless it is already supplied in the answer space.

Learn unit symbols exactly. Capitalisation matters: A, K, N and W are not interchangeable with a, k, n and w.

Do not add an “s” to make a unit symbol plural: write 5 kg, not 5 kgs.

An agreed standard used to express the measurement of a physical quantity.

A measurement needs both a numerical value and a unit: “20” alone is incomplete, whereas 20 s is a time measured in seconds.

A standard used to express a measurement, such as the second for time or the metre for length.

Write the unit with every numerical answer unless it is already supplied in the answer space.

Learn unit symbols exactly. Capitalisation matters: A, K, N and W are not interchangeable with a, k, n and w.

Do not add an “s” to make a unit symbol plural: write 5 kg, not 5 kgs.

Unit