Celsius to Kelvin - Overview, Formula, Features, FAQs

The Celsius and Kelvin scales are two commonly used temperature measurement systems in science and everyday life. While Celsius (°C) is widely used for everyday temperature readings, Kelvin (K) is the standard unit of temperature in the International System of Units (SI). The Kelvin scale is absolute, starting at absolute zero, where all molecular motion stops, while the Celsius scale is based on the freezing and boiling points of water. Understanding the relationship between these scales is essential for converting temperatures accurately in scientific calculations.

NEET 2025:  Mock Test Series | Syllabus | High Scoring Topics | PYQs

JEE Main: Study Materials | High Scoring Topics | Preparation Guide

JEE Main: Syllabus | Sample Papers | Mock Tests | PYQs

This Story also Contains

1. Absolute Zero
2. Temperature Conversions
3. Some Solved Examples

Absolute Zero

Absolute zero occurs at a temperature of 0 degrees Kelvin, or -273.15 degrees Celsius, or at -460 degrees Fahrenheit. It is a theoretical point at which molecular motion ceases.

Also read :

Temperature Conversions

The following is a list of conversion formulas

Celsius into Kelvin, K = ⁰C + 273.15

Celsius into Fahrenheit, F = (9/5) ⁰C + 32

Fahrenheit to Celsius, ⁰C = (5/9) (F-32)

Fahrenheit to Kelvin, K = (5/9) (F + 459.67)

Fahrenheit to Rankin, R = F + 459.67

Positions in Kelvin, K = (5/9) R

Freezing point of water=273.15K=0⁰C=32⁰F

Boiling point of water=373.15K=100⁰C=212⁰F

Some Solved Examples

Example 1: Convert 25°C to Kelvin.

Solution:

As we know,

K = °C+273.15K

K= 25+273.15 = 298.15 K

Hence, the temperature in Kelvin is 298.15 K.

Example 2: What is the freezing point of water in Kelvin?

Solution:

As we know, freezing point of water is 0°C.

Using formula, K = °C+273.15K

K = 0+273.15 = 273.15 K

Hence, the freezing point of water is 273.15 K.

Example 3: Convert the boiling point of water, 100°C, to Kelvin.

Solution:

As we know,

K = °C+273.15 K

K = 100+273.15 = 373.15 K

Hence, the boiling point of water is 373.15 K.

Example 4: The surface temperature on Pluto can drop to -230°C. Convert this to Kelvin.

Solution:

As we know,

K = °C + 273.15 K

K= −230 + 273.15 = 43.15 K

Hence, the temperature in Kelvin is 43.15  K.