People who travel to or from the USA often struggle with the change from Fahrenheit to Celsius. Suddenly they are faced with temperature degrees that mean nothing to them, in the same way that unfamiliar money currencies make it difficult to sense value. What is hot? What is cold? What is comfortable? Should you wear shorts or bring a jacket?
Celsius is a simple metric scale where water freezes at 0 degrees and boils at 100 degrees. Every whole degree change in Celsius is nearly 2 degrees in Fahrenheit, this is why it's easier to fine tune a thermostat in F to your perfect comfort level.
Here are a few common temperatures to remember:
|Water boils (at sea level)
|Really hot, sweating in the shade
|Wear a Jacket
|Wear gloves and a scarf
As an airline captain I will often announce both F and C temperatures as a courtesy to my international passengers, and I use this mental trick to quickly make the conversion.
Here is the easiest method to mentally convert to a temperature that you are familiar with, and it will generally be accurate to within a few degrees.
Just remember "Double Add Thirty".
To convert C ➡️ F: Double the Celsius degree, and add 30.
Convert 10 C to F
10 X 2 = 20
20 + 30 = 50
To convert F ➡️ C, just reverse the process. Start by subtracting 30, then divide by 2.
Convert 80 F to C
80 - 30 = 50
50 / 2 = 25
Play around with it and compare your results with the table above. You will start to lose some accuracy as you get into the higher temperatures, but you will at least be in the ballpark, and you will never again wonder what the temperature is.
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