There are 7 different gas cylinders filled with:
- hydrogen sulfide
- carbon dioxide
- sulfur dioxide
How do I determine how much of the respective gases is left?
Nitrogen and oxygen are in a gaseous state, so I reckon a glance at a pressure indicator will do. Air? The same. How about the last four cylinders which are filled with liquids? They have their vapor pressure, but I am not sure that those pressures can be used to accurately calculate the volume of respective liquids. Should the weight of the cylinder be measured?