**The temperature 39 degrees Celsius can be converted to Fahrenheit by multiplying the temperature by 180/100, or 1.8, and then adding 32.** In this case, 39 multiplied by 1.8 is 70.2, then added to 32 so it becomes 102.2. This means 39 C converts to approximately 102 F.

This formula can be used to perform conversion from any Celsius temperature to Fahrenheit. A quick way of performing the conversion mentally, without a calculator, is by doubling the Celsius temperature and adding 30. However, this method only gives a rough estimate and not a very accurate figure.

Converting Fahrenheit to Celsius follows an identical process, except in reverse. This means, subtracting 32 from the Fahrenheit temperature and then dividing by 100/180, or multiply by 0.55555. For instance, to convert 102 F to Celsius. Subtract 32 from 102, which is 70, and then divide by 100/180. This results in a temperature reading of 38.88 or approximately, 39 C.Celsius and Fahrenheit are both scales used to measure temperature readings. However, the Celsius scale belongs to the more popular metric system of units used by most countries, while Fahrenheit is belongs to International System of Units using in countries like the United States. Water freezes at 32 F and at 0 C. It boils at 212 F and 100 C.