'The density of iron is 7800 kg m−3'. What do you understand by this statement ?
It means that the mass of 1 m3 of iron is 7800 kg.
What do you mean by this statement :
The density of iron is 7.8gm cm-3
The density of brass is 8.4 g cm−3. What do you mean by this statement?
Refractive Index of diamond is 2.4. What do you understand by this statement?