slcmorro
87 Warning Points. Bad Boy!
The safest bet, is to measure your thermometer against another high quality one. Water doesn't always boil at 100c as a rule absolutely everywhere. At sea level where the atmospheric pressure is 1 atm (Earths atmospheric pressure @ sea level) it boils true at 100c. Atmospheric pressure changes it's actual boiling point, so dependant on where you are on the globe you can have fluctuations.