Quantities and Units
Quantities, Symbols and Units
Physics often involves looking at quantities:

A symbol is used to represent a quantity (v for speed)

A unit is what the quantity is actually measured in (m/s for speed)
Base Units and Derived Units
There are seven base units used in physics from which all the others can be derived:

Base units are the metre, kilogram, second, ampere, kelvin, mole and candela

Derived units include metres per second and kilograms per cubic metre
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