Physical Quantities and Measurement
- The ancient people use hand-span, foot-span, finger width, palm length, the distance of a step, etc. as units of measurements. These are known as non-standard methods of measurement.
- For length, the bigger units use are:
(i) Astronomical unit (A.U.): It is the mean distance between Earth and Sun. 1 A.U. = 1.496 1011 m
(ii) Light year (ly): It is the distance travelled by light in vacuum, in one year. 1 ly =9.46 1012 km
(iii)Parsec: 1 Parsec …
(iii)Parsec: 1 Parsec …
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