**When an alcohol thermometer is placed in 20-degree centigrade water the thermometer will record a temperature greater than 20 degrees centigrade**. According to the equation

T = v / v β

The temperature change is inversely related to the coefficient of expansion. The value of beta for alcohol is 1.12 x 10^{-4} C ^{-1}.

So, the temperature recorded by the alcohol thermometer would be greater than 20.

## Further explanation about the temperature recording:

**Temperature:**

It is a physical quantity that measures the hotness or coldness of any substance. The device used to degree temperature is a thermometer. Three commonplace scales are there to degree the temperature of a substance.

**Volume expansion** occurs when a substance is expanded in three-dimensional space. The expression for volume expansion is as follows:

…… (1)

Here,

is the change in volume.

is the initial volume.

is the coefficient of volume expansion.

is the temperature change.

Rearrange equation (1) for .

…… (2)

The temperature change is inversely related to the coefficient of volume expansion. The value of for mercury is 1.82 x 10^{-4} C ^{-1 }and that for alcohol is 1.82 x 10^{-4} C ^{-1}. So the temperature recorded by the alcohol thermometer will be greater than .

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