Temperature is one of the most important physical quantities in science and daily life. Two commonly used units of temperature are Celsius (°C) and Kelvin (K). While Celsius is widely used in everyday life, Kelvin is the SI unit of temperature and is mostly used in scientific research, physics, and chemistry.

If you are wondering “How to convert Celsius into Kelvin?”, this guide will explain the formula, step-by-step conversion, examples, and FAQs in a simple and easy-to-understand manner.

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What is Celsius (°C)?

• Celsius is a temperature scale widely used around the world.
• It is based on the freezing point of water at 0°C and the boiling point of water at 100°C (under normal atmospheric pressure).
• Symbol: °C

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What is Kelvin (K)?

• Kelvin is the SI unit of temperature used in scientific studies.
• It starts from absolute zero (0 K), the lowest possible temperature where molecular motion stops.
• Symbol: K
• Unlike Celsius, Kelvin does not use the degree (°) symbol.

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Formula to Convert Celsius into Kelvin

The Celsius to Kelvin conversion formula is very simple: K=°C+273.15K = °C + 273.15

👉 Just add 273.15 to the Celsius value to get the Kelvin value.

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Step-by-Step Conversion (How to Convert Celsius into Kelvin)

1. Take the temperature in Celsius (°C).
   Example: 25°C
2. Add 273.15 to the Celsius value.
   25 + 273.15 = 298.15
3. Write the result in Kelvin (K).
   Final Answer: 298.15 K

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Conversion Examples

• 0°C = 0 + 273.15 = 273.15 K
• 100°C = 100 + 273.15 = 373.15 K
• -40°C = -40 + 273.15 = 233.15 K

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Celsius to Kelvin Conversion Table

Celsius (°C)	Kelvin (K)
-100°C	173.15 K
-50°C	223.15 K
0°C	273.15 K
25°C	298.15 K
50°C	323.15 K
100°C	373.15 K

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Why Do We Use Kelvin Instead of Celsius?

• Kelvin is an absolute temperature scale, starting from absolute zero.
• It is widely used in scientific calculations because negative temperatures can cause confusion in physics and chemistry.
• Celsius is practical for daily life, but Kelvin is essential in scientific research.

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FAQs on Celsius to Kelvin Conversion

1. What is the formula to convert Celsius into Kelvin?

👉 K = °C + 273.15

2. What is 0°C in Kelvin?

👉 0°C = 273.15 K

3. Is Kelvin higher or lower than Celsius?

👉 Kelvin is always 273.15 units higher than Celsius.

4. Why do scientists prefer Kelvin?

👉 Because it starts at absolute zero and avoids negative values, making calculations easier.

5. Can Kelvin be negative?

👉 No, Kelvin cannot be negative because absolute zero (0 K) is the lowest possible temperature.

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Conclusion

Converting Celsius into Kelvin is very simple. You just need to add 273.15 to the Celsius temperature.

• Formula: K = °C + 273.15
• Example: 25°C = 298.15 K

Whether you are a student, teacher, researcher, or science enthusiast, understanding the Celsius-to-Kelvin conversion is essential for academic studies, scientific experiments, and practical applications.

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