Last Thursday we conducted a science experiment. We had three different concentrations of IPA, 70%, 91%, and one unknown, because it wasn’t marked on the bottle, possibly meaning that it was close to 100%. I won’t say here exactly what IPA is, but a carefully crafted Google acronym search might provide clues.

We put two tablespoons of each concentration in identical bowls, and lit them all similarly with matches. We found the 91% and the 100% lit very easily, with the 70% concentration of IPA being a little more hesitant in igniting.
The flame from the bowl containing the 100% IPA was the highest, followed narrowly by the 91% IPA. The bowl containing the 70% IPA had a considerably smaller flame.
The bowl containing 70% IPA burnt out first, even though there was still liquid left in the bowl. The 100% and 91% bowls lasted considerably longer, although the 91% lasted just barely longer than the 100% bowl. Both the 100% and 91% bowls were dry after the flame extinguished.