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## How do you convert alcohol percentage to proof?

Proof is a method of measuring the alcohol content of spirits. You calculate the proof of a spirits **product by multiplying the percent of alcohol by volume by two (2)**. For example, a spirits product that has a 40% alcohol content by volume is 80 proof [40 multiplied by 2 = 80].

## What proof is 70 alcohol?

70 proof simply means **35% ABV**. It is most common for flavored spirits and some higher-proof liqueurs. 70 proof is on the lower end of the scale since proof only measured hard alcohol.

## How do you make 90% alcohol?

take **785 ml** of 90% v/v ethanol, or 730 ml of 95% v/v ethanol, or 707 ml of 99% v/v ethanol; add distilled or filtered water to make up a volume of 1 litre; leave to cool and top up with water again to bring the volume back to 1 litre (mixing water and ethanol together produces a reaction whereby volume is reduced).

## Why is alcohol called proof?

The proof measurement harks back to 16th-century England, when **the government would put an extra tax on “proof spirits”**—that is, liquor that contained a certain higher amount of alcohol. … If the wet gunpowder could be lit, the alcohol was said to be a proof spirit and would therefore be taxed higher.

## How much is 1 standard drink?

Standard drinks are a way to measure how much alcohol you drink. Drinks come in different sizes and some are stronger than others. They have different amounts of alcohol in them. A standard drink is always **equal to 10 g of pure alcohol**.

## How many standard drinks can u drive an hour?

The general rule of thumb is that **2 standard drinks in the first hour will raise your BAC to 0.05%**, and 1 standard per hour thereafter will maintain that level. To do a quick calculation of whether you are over 0.05% BAC, simply take the number of hours since your first drink and add 1 to it.