SI Units Overview

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SI units abbreviation

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Le Système International d’unités is abbreviated to SI units.

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Kilogram

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The base unit of mass.

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Diagram of a tape measure

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Represents the concept of measuring length.

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Celsius (C)

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This scale uses increments of 1 degree and is most widely used by the building services industry. It has a zero point (0°C), corresponding to the temperature at which water freezes.

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Kelvin (K)

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This scale has the same increments as Celsius but has a minimum temperature called absolute zero, equal to –273°C.

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Kelvin scale zero point

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0K is equivalent to –273°C, known as absolute zero.

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Celsius scale usage

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Most widely used by the building services industry.

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SI derived unit for measuring the area of a floor space

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Square meters (m²)

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Measure of area

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Base SI unit: square metre (m²)

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Measure of volume

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Base SI unit: cubic metre (m³)