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Exercise2A page 152 thermometers measure temperature.0:01
There are different kinds, but they all have two parts a sensor where a physical change happens in response to temperature and and a way of converting this change into a number.0:22
In a mercury thermometer, for example, the mercury expands as it is heated and contracts when it is cooled, so the height of the liquid column changes according to a scale.0:32
Two of the most common scales are Celsius and Fahrenheit.0:42
In the early 18th century, Daniel Gabriel Fahrenheit set the freezing point of water at 32 degrees Fahrenheit and the boiling point at 212 degrees Fahrenheit.0:46
Later, in 1742, Anders Celsius determined the freezing point of water to be 100 degrees Celsius and the boiling point of water to be 0 degrees Celsius.0:57
Carl Linnaeus suggested reversing this with the freezing point of water set at 0 degrees Celsius.1:07
This is the scale used in most countries today.1:13
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