Temperature Converter
Convert temperatures between Celsius (°C), Fahrenheit (°F), and Kelvin (K) instantly.
Quick Reference
| Temperature | °C | °F | K |
|---|---|---|---|
| Water Boiling | 100 | 212 | 373.15 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Room Temperature | 20 | 68 | 293.15 |
| Water Freezing | 0 | 32 | 273.15 |
| Absolute Zero | -273.15 | -459.67 | 0 |
Understanding Temperature Scales
Temperature is a measure of the average kinetic energy of particles in a substance. Different temperature scales have been developed throughout history, each with its own reference points and applications. Understanding these scales and how to convert between them is essential in science, cooking, weather forecasting, and many other fields.
The Three Main Temperature Scales
Celsius (°C)
The Celsius scale, also known as the centigrade scale, was developed by Swedish astronomer Anders Celsius in 1742. It sets the freezing point of water at 0°C and the boiling point at 100°C at standard atmospheric pressure. This scale is used by most countries worldwide for everyday temperature measurements.
Fahrenheit (°F)
The Fahrenheit scale was developed by German physicist Daniel Gabriel Fahrenheit in 1724. It sets the freezing point of water at 32°F and the boiling point at 212°F. This scale is primarily used in the United States for weather, cooking, and everyday applications.
Kelvin (K)
The Kelvin scale is the SI (International System of Units) base unit for temperature. It was developed by Lord Kelvin (William Thomson) and starts at absolute zero, the theoretical lowest possible temperature where all molecular motion ceases. It's primarily used in scientific applications.
Temperature Conversion Formulas
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F - 32) × 5/9
Celsius to Kelvin: K = °C + 273.15
Kelvin to Celsius: °C = K - 273.15
Fahrenheit to Kelvin: K = (°F - 32) × 5/9 + 273.15
Practical Applications
- Cooking: Recipes may use different scales depending on origin
- Weather: Understanding forecasts in different countries
- Science: Laboratory measurements and calculations
- Medicine: Body temperature measurements
- Engineering: Material properties at different temperatures
Frequently Asked Questions
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at -40 degrees. -40°C = -40°F
Why does the US use Fahrenheit?
The US adopted Fahrenheit before the Celsius scale became widely used. Changing would require updating infrastructure and public education.
What is absolute zero?
Absolute zero (0 K or -273.15°C) is the theoretical lowest temperature where all molecular motion stops. It cannot actually be reached.