What temperature is shown on a Centigrade thermometer when a Fahrenheit thermometer reads 212?

The temperature conversion between Fahrenheit and Celsius (Centigrade) can be calculated using the formula:

C = (F - 32) × 5/9

Where C is the temperature in Celsius and F is the temperature in Fahrenheit. Plugging the Fahrenheit reading of 212 into this formula:

C = (212 - 32) × 5/9

C = (180) × 5/9

C = 100

Thus, when the Fahrenheit thermometer reads 212, the corresponding Celsius reading is 100 degrees. This is a well-known benchmark, as 212 degrees Fahrenheit is the boiling point of water at standard atmospheric pressure, which corresponds to 100 degrees Celsius.