0 degrees Celsius equals 273.15 kelvin.
The conversion from Celsius to kelvin adds a constant to the Celsius value to shift the zero point from the freezing point of water to absolute zero. This means 0°C corresponds exactly to 273.15 K because kelvin starts at absolute zero, unlike Celsius which starts at the freezing point of water.
Conversion Tool
Result in kelvin:
Conversion Formula
The formula to convert Celsius to kelvin is K = °C + 273.15. This formula works because Celsius measures temperature relative to the freezing point of water, while kelvin measures from absolute zero, the lowest possible temperature.
Adding 273.15 shifts the scale so zero Celsius equals 273.15 kelvin. This constant is exact, reflecting the difference between the two scales’ zero points.
Example calculation for 0°C:
- Start with Celsius: 0
- Add 273.15: 0 + 273.15 = 273.15
- Result: 273.15 K
Conversion Example
- Convert 25°C to kelvin:
- Start with 25
- Add 273.15: 25 + 273.15 = 298.15
- Result is 298.15 K
- Convert -10°C to kelvin:
- Start with -10
- Add 273.15: -10 + 273.15 = 263.15
- Result is 263.15 K
- Convert 100°C to kelvin:
- Start with 100
- Add 273.15: 100 + 273.15 = 373.15
- Result is 373.15 K
Conversion Chart
| Celsius (°C) | Kelvin (K) |
|---|---|
| -25.0 | 248.15 |
| -20.0 | 253.15 |
| -15.0 | 258.15 |
| -10.0 | 263.15 |
| -5.0 | 268.15 |
| 0.0 | 273.15 |
| 5.0 | 278.15 |
| 10.0 | 283.15 |
| 15.0 | 288.15 |
| 20.0 | 293.15 |
| 25.0 | 298.15 |
This chart shows Celsius temperatures from -25.0°C to 25.0°C with their kelvin equivalents. You can look up a Celsius value and see the corresponding kelvin by finding the row. It helps quick reference without calculating manually.
Related Conversion Questions
- What is the kelvin equivalent of 0 degrees Celsius?
- How do you convert 0 Celsius temperature into kelvin scale?
- Why does 0 Celsius equal 273.15 kelvin?
- What formula is used to change 0°C to kelvin?
- Can 0 degrees Celsius be expressed in kelvin without decimals?
- How does 0°C relate to absolute zero in kelvin?
- What does 0 Celsius temperature mean in kelvin units?
Conversion Definitions
Celsius: Celsius is a temperature scale where 0 degrees marks the freezing point of water and 100 degrees marks its boiling point under standard atmospheric pressure. It is widely used for everyday temperature measurements and scientific contexts, with each degree representing an equal interval of temperature change.
Kelvin: Kelvin is an absolute temperature scale starting at absolute zero, the lowest limit of thermodynamic temperature. Zero kelvin means no thermal energy. Kelvin is used in scientific fields, especially physics and chemistry, for precise temperature measurements without negative values.
Conversion FAQs
Why do we add 273.15 when converting Celsius to kelvin?
Adding 273.15 shifts the Celsius scale, which starts at water’s freezing point, so it aligns with the kelvin scale that begins at absolute zero. This adjustment accounts for the temperature difference between the two zero points, making temperature comparisons consistent.
Is the kelvin value for 0 Celsius always exactly 273.15?
Yes, the kelvin value for 0°C is exactly 273.15 K by definition. This constant is based on the difference between absolute zero and water’s freezing point, which does not change. However, measurement precision might affect reported values in practice.
Can temperatures below 0 Celsius have negative kelvin values?
No, kelvin temperatures cannot be negative because kelvin starts at absolute zero, the lowest possible temperature. Temperatures below 0°C are still above absolute zero, so their kelvin equivalents are positive values greater than zero.
Why is the kelvin scale used in scientific measurements?
The kelvin scale is preferred in science because it starts at absolute zero, making it absolute and avoiding negative values. This allows easier calculations in thermodynamics, physics, and chemistry, where temperature must be expressed as an absolute quantity.
Does 0 Celsius correspond to freezing or boiling point in kelvin?
0 Celsius corresponds to the freezing point of water, which is 273.15 kelvin. The boiling point of water at standard pressure is 100°C or 373.15 K, so 0°C is the lower temperature on this scale.