Dimensions and units Fluid characteristics(properties) can be described qualitatively in terms of certain Basic Dimensions'or Primary Quantities Length. L e Mass M e Time. T o Temperature, 0 Secondary quantities'can be derived in terms of the primary quantities, e.g ●Area,L2 e Velocity lt ● Densi Ity, ML-3 Units are standards for quantitative measurement: m 8Dimensions and Units Fluid characteristics (properties) can be described qualitatively in terms of certain ‘Basic Dimensions’ or ‘Primary Quantities’ : • Length, L • Mass, M • Time, T • Temperature,  ‘Secondary Quantities’ can be derived in terms of the ‘primary quantities’, e.g. • Area, L2 • Velocity LT-1 • Density, ML-3 Units are standards for quantitative measurement : m, s, kg