Unit Second Metre Mole Ampere Candela Kilogram Kelvin Unit Symbol s m mol A cd kg K Base Measure Time Length Amount of Substance Electric Current Luminous Intensity Mass Temperature MEMORY TIP Can be remembered by the acronym ‘SMMACKK’ S econd M etre M ole...
Used to indicate multiples or fractions of a unit Based on the decimal system – represent multiples of 10 Standardised for use in the international system of units Units still considered to be SI units when given a prefix Prefix Name yotta zetta exa peta tera...
Unit Kelvin Unit Symbol K Base Measure Temperature Physical Constant Boltzmann's Constant (k) - relationship between a particles kinetic energy and temperature Definition Defined by taking the Boltzmann constant k to be a fixed numerical value of...
Unit Candela Unit Symbol cd Base Measure Luminous Intensity Physical Constant Luminous efficacy of monochromatic radiation of frequency 540×1012 Hz (Kcd) Definition Defined by taking the fixed numerical value of Kcd, to be 683 expressed in the units...
