# Celsius reading varies directly on the difference between Fahrenheit reading and 32 F. If a Celsius thermometer reads 100 when a Fahrenheit reads 212°, how do you find the Celsius reading when the Fahrenheit reading is 32°?

Jun 5, 2018

${32}^{o} F = {0}^{o} C$

#### Explanation:

You can easily find the answer on the Internet, for instance here: https://www.rapidtables.com/convert/temperature/how-fahrenheit-to-celsius.html

You can also find websites that convert the number for you.

Just remember that there are ${9}^{o} F$ on ${5}^{o} C$

As $- {40}^{o} F = - {40}^{o} C$, my favourite formula is

${T}_{C} = \left({T}_{F} + 40\right) \frac{5}{9} - 40$
This gives ${32}^{o} F = {\left[\left(32 + 40\right) \frac{5}{9} - 40\right]}^{o} C$
=${\left[\frac{72 \cdot 5}{9} - 40\right]}^{o} C = {0}^{o} C$