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Temperature

Temperatureis the measure of hotness or coldness of an object. Temperature can be measured in metric units or in U.S. customary units. We can use a thermometer that has both a Celsius ($°C$) and a Fahrenheit ($°F$) scale to measure the temperature.

The following table shows the different temperatures on Celsius ($°C$) and a Fahrenheit ($°F$) .

Temperature	Fahrenheit ($°F$)	Celsius ($°C$)
Normal Human Body Temperature	$98°F$	$37°C$
Room Temperature	$68°F$	$20°C$
Water Boils	$212°F$	$100°C$
Water Freezes	$32°F$	$0°C$

Metric Units

In metric unit, temperature is measured in degrees Celsius ($°C$). The Celsius scale is also called thecentigrade scalesince it's divided into$100$degrees. The Swedish astronomer Anders Celsius who developed Celsius temperature scale.

U.S. Customary Units

In the customary unit, temperature is measured in degrees Fahrenheit ($°F$). The physicist Gabriel Daniel Fahrenheit who named Fahrenheit ($°F$) in$1724$．

The thermometers on the above figure show the water freezes at$0°C$or$32°F$and boils at$100°C$or$212°F$．

To converttemperatures from Fahrenheit to Celsius, use the formula$C=\frac{5}{9}(F-32)$and for Celsius to Fahrenheit is$F=\frac{9}{5}C+32$．

For Example, the lowest recorded temperature in Oklahoma is$-31°F$on February$9$,$2011$．找到摄氏度的温度。

The expression to convert a temperature in Fahrenheit to degree Celsius is$C=\frac{5}{9}(F-32)$．

To convert$-31°F$to degree Celsius, first replace$F$with$-31$．

$\begin{array}{l}\frac{5}{9}(F-32)=\frac{5}{9}(-31-32)\\ =\frac{5}{9}(-63)\end{array}$

Next, multiply.

$\frac{5(-63)}{9}=\frac{-315}{9}$

Now, divide.

$=-35$

Therefore, the temperature in degrees Celsius is$-35°C$．

Note: The Kelvin($K$), a unit of thermodynamic temperature, is the$\frac{1}{273.16}$of the absolute temperature of the triple point of water.