What are the units of length, time, mass, in SI?

In the international system of units SI, length, mass and time are the main physical units and have the following dimensions:
1) the unit of length is a meter (m, the length of the path that sunlight travels in a vacuum in 1/299792458 s);
2) the unit of time is a second (s, the time is 9192631770 periods of radiation of cesium-133 atoms);
3) mass unit – kilogram (kg, body weight, which is numerically equal to the international kilogram prototype).

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