There are two main temperature scales. The older scale, Fahrenheit, was first used in 1724 by German physicist Daniel Fahrenheit. The Celsius scale was developed 18 years later by Swedish astronomer Anders Celsius, just two years before his death. Today almost all countries use the Celsius scale except for the United States and some small countries. A question Americans often face when going overseas is how to convert from Celsius to Fahrenheit. A 43-degree Celsius reading represents heat most places in the United States never reach. But it's common in Western Australia, for example.
Instructions
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Type 43 into the calculator.
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Multiply this value by 1.8 and press the "equals" symbol for a 77.4 result.
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Add 32 to 77.4. Forty-three Celsius is 109.4 degrees Fahrenheit.
To convert the other way, just reverse the process. For 100 Fahrenheit, calculate (100 - 32) / 1.8 = 37.8 degrees Celsius.