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What's the gas expansion ratio for ethanol? Answered

At normal atmospheric pressure. Don't need too precise a figure, nearest 50 will do.

Surprisingly difficult information to find...

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What do you mean? Vapour pressure or volume gas per ml liquid?
I'll assume you want "how much gas do I get at the boiling point?".
Molar volume of a gas at 25oC is ~ 25 L, which is 46g, or ~58ml.

Treating it as an ideal gas, V=RT/P
At boiling point and atmospheric pressure V ~29 Litres gas for 58ml liquid, or about 500x liquid volume.

L

I had a look at that, but as is my way now of outsourcing all my thinking to the internet: wolfram alpha.

Pressures shouldn't be an issue.