Question

Atomic mass in unified mass means what?

Answer 1

because atom itself is very minute in size which cannot be seen by naked eyes

Answer 2

Explanation:

$your \: answer$

The dalton or unified atomic mass unit (symbols: Da or u) is a unit of mass widely used in physics and chemistry. It is defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.