Unit & Dimensions
Important Practical Units
Length
- Astronomical Unit (au): Distance Between the centre of Earth and
the centre of the Sun (1 au = 1.5 x 1011 m)
- Light Year (ly): Distance travelled by light in vacuum in one year.
- 1 Angstrom = 10-10 m
mass & weight
- The largest practical unit of mass is Chandrasekhar limit (CSL).
- Atomic or nuclear masses are made in terms of a unit called amu
(atomic mass unit).
