What is 0.2kg into gallons?

Answer 1

It depends entirely on the substance. 0.2 kilograms of lead take up much less space then 0.2 kilograms of water, and 0.2 kilograms of air takes up much more space! You must know the density of the thing you are measuring to know this answer.

Roughly 200g if it is 0.2 liters of water, but different substances will have different masses , and there will be differences for different temperature and pressure.

Answer 2

That is about 1/5 of USG