What's the formula to convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. The formula is °F = (°C × 9/5) + 32. For example, 20°C equals (20 × 1.8) + 32 = 68°F. This accounts for the different zero points and scale sizes between the two systems.

How do I convert Fahrenheit to Celsius?

To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. The formula is °C = (°F - 32) × 5/9. For example, 68°F equals (68 - 32) × 5/9 = 20°C. This reverses the Celsius-to-Fahrenheit conversion.

What is Kelvin and how is it different from Celsius?

Kelvin is the SI base unit of temperature used in scientific contexts. It uses the same scale size as Celsius but starts at absolute zero (-273.15°C), the coldest possible temperature. To convert Celsius to Kelvin, simply add 273.15. Unlike Celsius and Fahrenheit, Kelvin has no negative values.

Why are there different temperature scales?

Fahrenheit was developed for weather and everyday use in the US, with 0°F as very cold and 100°F as very hot. Celsius uses water's freezing (0°C) and boiling (100°C) points for reference. Kelvin starts at absolute zero for scientific calculations. Each scale serves different practical or scientific purposes.

At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are equal at -40 degrees (-40°C = -40°F). This is the only point where both scales show the same numerical value. You can verify this by plugging -40 into either conversion formula.