Question

Define one amu.

Answer 1

Definition of one amu:

1. One amu is one atomic mass unit.
2. The unit of the atomic mass of an atom of an element is known as atomic mass unit (amu).
3. Atomic mass unit is expressed as $\mathrm{u}$.

Example:

Atomic mass of hydrogen atom is $1\mathrm{amu}$ or $1\mathrm{u}$.