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Learning to use the metric system.
Converting Celsius to Fahrenheit
A common way for a quick rough guess:
Double it, add 32
A more precise way:
Double it, minus 10%, add 32
20 degrees Celsius - double = 40
Minus 10% 40- 4 = 36
36 + 32 = 68 degrees Fahrenheit
The metric system is used all over the world, except the United States and Burma.
In 1654, the first thermometer was invented; however it was in an unmarked tube where no degrees were logged. In 1701 Sir Isaac Newton took this idea and developed it further by marking a “0” on the tube representing the melting point of ice and a “12” representing body temperature.
Gabriel Fahrenheit, a German scientist, came into the picture in 1714 improving Newton’s idea by dividing his scale into much smaller increments. His scale for freezing point of water happened to be at 32 degrees on his tube, and the boiling point of water was set at 212. The difference between the two was 180 degrees, an easy mathematical number to work with, so Fahrenheit felt he had the perfect thermometer.
By 1742, Anders Celsius created a new mercury thermometer by setting the scale in 100 increments. This Swedish astronomer invented the Centigrade scale (known today as ‘degrees Celsius’) where “0” is set for freezing point and “100” is set for boiling point, thus creating a convenient 100 degrees between freezing and boiling.