Question

why do we have different units for some physical quantity, Express unified atomic mass unit in kg.​

Answer 1

Answer:

Unified atomic mass unit (amu) or (u) =

12

1

the mass of one carbon (C

12

) atom.

By Avogadro's number 6.023×10

23

we know that mass of 6.023×10

23

atoms of carbon

6

C

12

is equal to 12 gm.

So mass of one atom of

6

C

12

=

6.023×10

23

12

gm

1 amu=

12

1

mass of one

6

C

12

=

12

1

×

6.023×10

23

12

gm

1.66×10

−24

gm

1 amu=1.66×10

−27

kg