used primarily by American engineers. Like the Fahrenheit scale, the Rankine scale has a difference of 180 degrees between the freezing point (491.7 R.) and boiling point (671.7 R.) of water, but the zero point is absolute zero (–459.7 F.), the lowest temperature theoretically possible.
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?
