Nitrous oxide vs Water injection - which one cools best?

[JohnA]

I am expanding the 'NOS' page of my site lately, so I am delving into information that I didn't have before.

I suspect that the much-hyped cooling effects of nitrous may not be as dramatic as some people want to believe.

I, too, thought that there will be cool gas squirting out of a bottle, even if it is not pushing liquid. What the heck, conventional wisdom, eh?
Well, this is actually incorrect: I had a friend position a bottle in a way that the pickup tube inside was only picking gas (they do this all the time these NOS folks!)
Guess what? the gas coming out was room temp. Not super-cool, not even cool-ish. Room temp. I (reluctantly) put my hand and there was no cooling whatsoever. The bottle was mostly full, by the way.

So the cooling advantage applies only when liquid is delivered in the manifold (not as often as most people think)