Memory trick, jump the glass from degrees C to degrees F
777 is the key
Anders Celsius and Daniel Gabriel Fahrenheit invented their temperature scales in the 1700s. I encounter both regularly.
You probably know 0 C is exactly 32 F, and 100 C is exactly 212 F. You might know that -40 C is -40 F, the one temperature where the two scales agree.
Keep reading with a 7-day free trial
Subscribe to Richard Rusk, Engineer to keep reading this post and get 7 days of free access to the full post archives.