How much is $325F$ in $^ \circ C$?

Hint: The conversion formula to Fahrenheit scale to Celsius scale of reading is calculated with respect to the freezing point of water.
The conversion formula of Fahrenheit scale to Celsius scale is given by $C = \dfrac{5}{9}(F - 32)$
Where F refers to the temperature in Fahrenheit, and C refers to the temperature in the Centigrade scale.

Complete answer:
Temperature is a measure of hotness or coldness expressed on any of numerous arbitrary scales that indicates the direction in which heat energy would naturally flow—that is, from a hotter (higher) body to a colder (lower) body (one at a lower temperature).
Three temperature scales are in general use today. The Fahrenheit ($F$) temperature scale, The Celsius ($^ \circ C$) temperature scale, The Kelvin ($K$) scale
Celsius- This is the most widely used and easiest-to-understand temperature scale in the world. Centigrade is a term for Celsius that has been used for a long time. Water has a freezing point of $0$ degrees Celsius and a boiling point of $100$ degrees Celsius. $C$ is the abbreviation for Celsius.
Fahrenheit- Fahrenheit is still widely used in the United States, and older people in the United Kingdom prefer it. Water has a freezing point of $32$ degrees Fahrenheit and a boiling point of $212$ degrees Fahrenheit. $F$ is the abbreviation for Fahrenheit.
using the conversion formula of Fahrenheit scale to Celsius scale
$C = \dfrac{5}{9}(F - 32)$
$ \Rightarrow C = \dfrac{5}{9}\left( {325 - 32} \right)$
$ \Rightarrow C = \dfrac{5}{9} \times 293$
$ \Rightarrow C = 162.77$
Hence, $325F$ in $^ \circ C$ is $ \Rightarrow C = 162.77$

Note:
The conversion formula for Celsius scale to Fahrenheit scale is $F = \dfrac{{9C}}{5} + 32$
Temperature is an intensive property, like pressure or density, in that it is independent of the quantity of matter being considered, as opposed to widespread characteristics like mass or volume.