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3) I overheard someone at school saying that they took a “shot” of alcohol that was “80 proof.” What were they talking about?

In the U.S., a “shot” is another name for a one ounce serving of alcohol (the size varies in other countries). Generally this refers to hard alcohol (tequila, rum, and vodka for example). People typically take “shots” using a shot-glass, which is a small glass or plastic cup.

“Proof” refers to the percentage of actual alcohol in a drink. For example, beer has 2-6% alcohol, which is about 4-12 proof. Hard alcohols have anywhere from 40-60% alcohol in them, which is anywhere from 80-120 proof. 100% alcohol would be 200 proof, 50% alcohol would be 100 proof, and so on. “Everclear,” the brand name of a pure grain alcohol, is the notable exception to this rule at 190 proof, or 95% alcohol. So taking a shot of Everclear is like having two shots of vodka at the exact same time, which is also why it kills thousands of people a year and is illegal in most states and the rest of the world. Most of the alcohol that people buy is 80 proof, or 40% alcohol.

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