Complete Guide to Celsius to Kelvin Temperature Conversion
The Celsius Scale (°C)
The Celsius scale, also known as centigrade, is a temperature scale used by the International System of Units (SI). It is based on the freezing point of water at 0°C and the boiling point of water at 100°C under standard atmospheric pressure. Developed by Swedish astronomer Anders Celsius in 1742, this scale is widely used worldwide for everyday temperature measurements, from weather forecasts to cooking and medical applications.
The Kelvin Scale (K)
The Kelvin scale is the fundamental unit of thermodynamic temperature measurement in the International System of Units (SI). Unlike Celsius and Fahrenheit, Kelvin is an absolute temperature scale where 0 Kelvin (0 K) represents absolute zero, the theoretical point where all molecular motion ceases. Named after British physicist Lord Kelvin, this scale is essential in scientific research, physics, astronomy, and engineering applications.
Celsius to Kelvin Conversion Reference Table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 °C | 0 K |
| -100 °C | 173.15 K |
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 37 °C | 310.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
| 200 °C | 473.15 K |
| 500 °C | 773.15 K |
| 1000 °C | 1273.15 K |
Celcius and Kelvin Temperature Reference Points
Celsius to Kelvin Conversion - Frequently Asked Questions
Why is adding 273.15 the correct way to convert Celsius to Kelvin?
The conversion K = °C + 273.15 works because Kelvin and Celsius share the same increment size. The 273.15 offset represents the difference between absolute zero (0 K = -273.15°C) and the freezing point of water (0°C). This linear relationship makes the conversion straightforward.
What is absolute zero in Celsius and Kelvin?
Absolute zero, where all molecular motion ceases, is -273.15°C on the Celsius scale and 0 K on the Kelvin scale. No temperature can exist below 0 K, making Kelvin essential for scientific calculations involving gas laws and thermodynamics.
How do Celsius and Kelvin relate to water freezing and boiling points?
Water freezes at 0°C (273.15 K) and boils at 100°C (373.15 K). The 100-degree interval between freezing and boiling on Celsius corresponds to a 100-Kelvin interval on the Kelvin scale.
Why do scientists prefer Kelvin over Celsius for research?
Kelvin is an absolute temperature scale with no negative values. Using Kelvin eliminates negative temperatures in calculations such as the ideal gas law (PV = nRT), thermodynamic equations, and radiation measurements.
Is there a temperature where Celsius and Kelvin have the same numerical value?
No. Celsius and Kelvin never have the same numerical value because of the 273.15-degree offset. Celsius and Kelvin always differ by exactly 273.15.