relative gas density
 

Dear people,
may i ask if i got this as the right definition of relative gas density?:
The relative density of a gas is its density divided by the density of hydrogen (or sometimes dry air) at the same temperature and pressure

please help
 

can someone please help me if i got the right definition? :(

http://en.wikipedia.org/wiki/Relative_density

That website suggests that you're right about air. It doesn't say anything about hydrogen. I can't remember studying this topic myself.

thank you so much
 

thank you for your help :P :P :P :P