used in everyday temperature measurement in the United States. On this scale, the freezing point of water is 32 and its boiling point 212. (The zero point was assigned to the temperature of a mixture of ice and salt, which in the early 1800's was the lowest temperature attainable in the laboratory.)
Thermometers are used to measure the temperature of all sorts of things, from a fever to the heat in an oven to the weather. Various thermometers exist with various scales for temperature measurement. Take this quiz to see how much you know about thermometers.
Every night on the news, the weatherperson reports the UV index. What is the UV index and how is it calculated?
