I’ve come across this fact stating something along the lines of ‘a 40% alcohol solution is ineffective at killing germs, but anything between 60% – 90% is.” Why is that?
The fact I’m referring to can be found [here](https://www.insider.com/does-alcohol-kill-germs), [here](https://www.cdc.gov/infectioncontrol/guidelines/disinfection/disinfection-methods/chemical.html#Alcohol) and [here](https://blog.gotopac.com/2017/05/15/why-is-70-isopropyl-alcohol-ipa-a-better-disinfectant-than-99-isopropanol-and-what-is-ipa-used-for/)
In: Biology
40% is too diluted to penetrate, anything over 90% evaporates before it can fully penetrate. 60 to 90 is just right.
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