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1018, used in some measurements
a mark on something used for measuring, for example one of the marks showing the temperature on a thermometer
maths relating to a system of measurement in which weight is measured in pounds, length is measured in feet, and volume is measured in pints
maths using or relating to the metric system of measurements
1015, used in some measurements
Système International unit: a standard scientific unit of measurement in an international system. The main units are the metre, kilogram, second, ampere, kelvin, and mole.