about physics

STANDARDS OF LENGTH, MASS, AND TIME
The laws of physics are expressed in terms of basic quantities that require a clear definition.
In mechanics, the three basic quantities are length (L), mass (M), and time
(T). All other quantities in mechanics can be expressed in terms of these three.

we are to report the results of a measurement to someone who wishes to reproduce
this measurement, a standard must be defined. It would be meaningless if
a visitor from another planet were to talk to us about a length of 8 “glitches” if we
do not know the meaning of the unit glitch. On the other hand, if someone familiar
with our system of measurement reports that a wall is 2 meters high and our

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