Question

Question #59747

Answer 1

It isn't really a case of being "equal to", its more a case of having a certain volume. BUT it all depends on density.

Explanation:

If you consider water, which has a density more or less equal to 1 `g.cm^-3`, then a mass of 1 gram will have a volume of 1 ml. And similarly a mass of water of 1 kg will have a volume of 1 litre.

But if you are considering something else, with a different density, then its a different calculation. If you take, for example, something like engine oil, this will have a density of around 0.9 `g.cm^-3`. So 1 g of engine oil will have a volume of slightly more than 1 ml (1/0.9 = 1.11 ml). On the other hand, if you take something more dense, like some polyethylene, that has a density of around 1.2 `g.cm^-3`, so 1 g of this will have a volume of 0.83 ml (volume of a solid would normally be measured in `cm^3` but technically it can also be in ml - volume is volume).

So for water, 1 g is not "equal to" 1 ml, but it does have this volume.