What is the origin of the term Celsius
We know degrees Celsius as a unit of measurement for how warm or cold it is. Celsius is actually the last name of a Swedish researcher. Anders Celsius lived 300 years ago and was interested in temperatures, i.e. whether something was warm or cold.
Anders Celsius used a thermometer. The word comes from the Greek and means "heat meter". For him it was a long tube made of glass with mercury in it. Mercury is a liquid metal. When it's cold, it contracts and can only be seen at the bottom in the thermometer. When it is warm, mercury expands and rises up the tube of the thermometer. In other words: the warmer it is, the longer the mercury is in the thermometer.
How did Celsius know how cold or warm it actually was? He assumed when water freezes and when it boils, i.e. boils. When it was so cold that the water froze, he made a mark on the thermometer where the mercury was. He called that zero degrees. Then he brought water to a boil and held the thermometer in it. He drew another line where the mercury was now. He divided the distance in between into 100 steps, which are called degrees. That is why they say: water starts to boil at 100 degrees.
Anders Celsius died in 1744. Shortly afterwards, a friend of his named this temperature measurement after Celsius. Today degrees Celsius is common in all countries in the world. We use it to measure fever, the cold in the refrigerator and all sorts of other things. In some countries, however, most people use a different classification: in the US or UK, for example, the temperature is measured in degrees Fahrenheit.
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