Let's get this obvious fact out of the way: Alcohol is very flammable. Anything over 80 proof will light on fire. The higher the proof, the easier it will ignite. Do not leave a shot burning for longer than necessary.

What alcohol catches on fire?

Whiskey, Vodka, Tequila and Gin

The more common stuff, which averages around 40 percent alcohol by volume, will burn a small blue flame over the top of the drink that goes out with a light breath — same for vodka, tequila and gin.

How strong is 90 proof?

(Phew.) 3: In the United States, the system — established around 1848 — is a bit simpler: “Proof” is straight up two times alcohol by volume. So a vodka, say, that is 40 percent ABV is 80 proof and one that is 45 percent ABV is 90 proof. A “proof spirit” is 100 proof (50 percent ABV) or higher.