gas method without exit bag like Sarco machine

[jizz676]

I heard of people dying in a small room with lpg or gpl gas in an hour (all outputs have to be closed)...or in a car (one girl who had the gas directly in her mouth by a tube died..the other was saved)...
but lpg is explosive therefore dangerous...
if you use helium argon nitrogen or liquid nitrogen (isnt liq nitro dangerous because of cold burns and freezing of your body?) in car or small room would it work as the Sarco? how many liters are needed and how many dollars for it? and is it painless?

 

[TiredHorse]

I suspect you could perhaps turn your car into a Sarco-like apparatus if you used enough liquid N2. LN2 is concentrated enough that I could see the possibility of dumping a big bucket (!?) of it into the back seat as you're sitting in the front, and the resulting expansion of the LN2 into gas both flooding the car with N2 and flushing out the air. If you didn't get the N2 on yourself you would not suffer cold burns/frostbite, but I imagine the atmosphere would become very cold very quickly.

I have no idea how much LN2 you'd need, cost would be dependant on local source, and it would probably be about as painless as eb/N2.

You'd get points for novelty, but I don't see it as an effective method to ctb.