Thermometers are one of the most widely used tools that are used today to find temperature. But do people really know how they work? 

Thermometers work by expanding and contracting particles. 

There is a unit conversion to find the temperature in C from F.

This formula is : (F-32)/1.8

To find F from C, the formula would be:

To understand the formula for converting Celsius to Fahrenheit, you have to think it out a bit more.
                        (F-32)/1.8
You first subtract the F degrees by 32, since 32 is the difference between the starting points.

Then, you would divide  by 1.8 because the Fahrenheit scale goes up by 180 increments, and the Celsius scale goes up by 100 increments, so when you divide them it would equal 1.8.

The other formula would be the exact opposite!

But in a larger sense, we can never forget that the Thermometer is ONLY affected by the particles outside of the tube. These particles hit the surface of the tube, and this changes the liquid inside.