Fluid used for measuring combustion chamber volume

Hi All,

What kind of fluid is it the best to use for measuring cumbustion volume?

I've saw on youtube isopropyl alcohol, I am not too convinced with that, because it evaporates quickly.

I've tried to search on the forum with no luck:(

Kindest regards

Tibor

I've always used Kerosene - or you may know it as paraffin. It has either low surface tension or low viscosity (or some other physical property that I'm confusing) that allows it to flow well into small voids and it is not repelled from oil etc.