If a temperature is given in Celsius and you need Fahrenheit, what should you do?

• A. Convert temperatures to a common scale.
• B. Ignore the difference.
• C. Convert Celsius to Kelvin only.
• D. Use a fixed offset regardless of scale.

Answer: (A)

Temperatures are expressed on different scales because each scale has its own zero point and unit size. When you need a Fahrenheit value from Celsius, you must convert using the standard formula that brings the number onto the same scale. The correct approach is to multiply the Celsius temperature by 9/5 and then add 32. This accounts for both the different unit sizes and the offset between Celsius and Fahrenheit. For example, 25 °C equals 25 × 9/5 + 32 = 77 °F. If you ever need the other direction, Celsius can be found from Fahrenheit with C = (F − 32) × 5/9. Converting to Kelvin is another possibility if you’re working in Kelvin, but to obtain Fahrenheit specifically you should use the Fahrenheit conversion formula.