State the three basic SI units and their quantities as used in measurements
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The three basic SI units for measuring the physical quantities of length, mass, and time are the meter, kilogram, and second (abbreviated as m, kg, and s, respectively). These units are used to measure other physical quantities such as density, velocity, and energy. For example, the unit for measuring density is kilograms per cubic meter (kg/m^3), the unit for measuring velocity is meters per second (m/s), and the unit for measuring energy is joules (J).