# Celsius vs. Kelvin: What's the Difference?

Edited by Sumera Saeed || By Sawaira Riaz || Updated on November 28, 2023
Celsius is a temperature scale with water freezing at 0° and boiling at 100°, while Kelvin starts at absolute zero, with no negative temperatures.

## Key Differences

Celsius, a unit of temperature commonly used in daily life, measures water's freezing point at 0 degrees and boiling point at 100 degrees. Kelvin, in scientific contexts, sets its zero point at absolute zero, the theoretically coldest possible temperature.
Sawaira Riaz
Nov 25, 2023
Celsius is often used in weather forecasts, making it relatable for general public understanding. Kelvin, however, is prevalent in scientific research, particularly areas studying extremely low temperatures, like cryogenics.
Sawaira Riaz
Nov 25, 2023
Celsius degrees are each equivalent to a Kelvin, but the scales start at different points, with Kelvin being 273.15 degrees higher. Therefore, temperature conversions between the two systems require mathematical adjustments.
Sawaira Riaz
Nov 25, 2023
Celsius is a crucial part of the metric system, utilized worldwide for various temperature-related measurements. Kelvin is the SI unit for temperature, fundamental in scientific equations, and calculations, especially in thermodynamics.
Aimie Carlson
Nov 25, 2023
Celsius, easily relatable in everyday experiences like cooking or traveling, helps people globally navigate temperature-sensitive tasks. Kelvin, being absolute, aids scientists in avoiding negative numbers, simplifying certain thermodynamic equations like those used in the study of gases.
Sawaira Riaz
Nov 25, 2023

## Comparison Chart

### Zero Point

0°C (freezing point of water)
0K (absolute zero)
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Nov 25, 2023

### Usage

Daily activities, weather reports
Scientific research, thermodynamics
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Nov 25, 2023

### Measurement

Degrees Celsius (°C)
Kelvins (K)
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Nov 25, 2023

### Range

Typically from -100°C to 100°C
Starts at 0K, no negative numbers
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Nov 25, 2023

### Relation to Water

Freezing at 0°C, boiling at 100°C
Freezing at 273.15K, boiling at 373.15K
Harlon Moss
Nov 25, 2023

## Celsius and Kelvin Definitions

#### Celsius

Part of the centigrade system with 100 degrees between freezing and boiling of water.
At 100 degrees Celsius, water begins to boil.
Janet White
Oct 19, 2023

#### Kelvin

The SI unit of thermodynamic temperature, starting at absolute zero.
This substance freezes at 255.37 Kelvin.
Sawaira Riaz
Oct 19, 2023

#### Celsius

Named after the astronomer Anders Celsius.
Did you know the Celsius scale is named after a Swedish scientist?
Janet White
Oct 19, 2023

#### Kelvin

Used in scientific contexts, especially in the study of extreme temperatures.
We use Kelvin in cryogenic temperature measurements.
Sara Rehman
Oct 19, 2023

#### Celsius

A scale for measuring temperature, where water freezes at 0 degrees.
The forecast says it's 20 degrees Celsius outside.
Harlon Moss
Oct 19, 2023

#### Kelvin

A scale with no negative values, simplifying many scientific calculations.
At zero Kelvin, also known as absolute zero, all molecular motion ceases.
Sawaira Riaz
Oct 19, 2023

#### Celsius

Commonly used in daily life for weather temperature.
It's chilly today, maybe 5 degrees Celsius.
Harlon Moss
Oct 19, 2023

#### Kelvin

Named after the physicist William Thomson, 1st Baron Kelvin.
The Kelvin scale was named after a prominent British scientist.
Sawaira Riaz
Oct 19, 2023

#### Celsius

A metric unit of temperature used worldwide.
This oven can heat up to 250 degrees Celsius.
Sawaira Riaz
Oct 19, 2023

#### Kelvin

A unit of absolute temperature equal to 1/273.16 of the absolute temperature of the triple point of water. One kelvin degree is equal to one Celsius degree. See Table at measurement.
Sawaira Riaz
Oct 14, 2023

#### Celsius

Of or relating to a temperature scale that registers the freezing point of water as 0° and the boiling point as 100° under normal atmospheric pressure. See Table at measurement.
Sawaira Riaz
Oct 14, 2023

#### Kelvin

Kelvin A temperature scale in which zero occurs at absolute zero and each degree equals one kelvin. Water freezes at 273.15 K and boils at 373.15 K.
Sawaira Riaz
Oct 14, 2023

#### Celsius

Alternative case form of Celsius
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Oct 14, 2023

#### Kelvin

In the International System of Units, the base unit of thermodynamic temperature; 273.16 of the thermodynamic temperature of the triple point of water. Shown as "K".
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Oct 14, 2023

#### Celsius

The Celsius thermometer or scale, so called from Anders Celsius, a Swedish astronomer, who invented it. It is the same as the centigrade thermometer or scale.
Sawaira Riaz
Oct 14, 2023

#### Kelvin

A unit interval on the Kelvin scale.
The interval between the freezing and boiling points of water is 100 kelvins.
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Oct 14, 2023

#### Celsius

Swedish astronomer who devised the centigrade thermometer (1701-1744)
Sawaira Riaz
Oct 14, 2023

#### Kelvin

(usually as postpositioned adjective) A unit for a specific temperature on the Kelvin scale.
Ice melts above 273.15 kelvins.
Water boils above 373.15 kelvins.
Sawaira Riaz
Oct 14, 2023

#### Kelvin

The SI unit of temperature, defined as being 1/273.16 of the triple point of water; abbreviated K. The melting point of water at 760 mm pressure is 273.15 Kelvins, and the boiling point 373.15 Kelvins. One degree Kelvin is equal to one degree Centigrade, and
Sawaira Riaz
Oct 14, 2023

#### Kelvin

The basic unit of thermodynamic temperature adopted under the Systeme International d'Unites
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Oct 14, 2023

#### Kelvin

British physicist who invented the Kelvin scale of temperature and pioneered undersea telegraphy (1824-1907)
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Oct 14, 2023

#### Kelvin

Essential in expressing laws of thermodynamics.
In this experiment, we calculate temperature in Kelvin for accuracy.
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Oct 19, 2023

## FAQs

#### Is Celsius used in science?

Yes, though Kelvin is preferred for scientific research.
Sawaira Riaz
Nov 25, 2023

#### Which is larger, a degree Celsius or a Kelvin?

They are equivalent, but the scales have different starting points.
Janet White
Nov 25, 2023

#### What's water's boiling point in Kelvin?

Water boils at 373.15 Kelvin.
Sara Rehman
Nov 25, 2023

#### Is Celsius used in the United States?

No, the United States primarily uses Fahrenheit.
Sawaira Riaz
Nov 25, 2023

#### What's absolute zero in Celsius?

Absolute zero is -273.15 degrees Celsius.
Sawaira Riaz
Nov 25, 2023

#### Why is Kelvin used in science?

Its starting point of absolute zero avoids negative temperatures, simplifying calculations.
Aimie Carlson
Nov 25, 2023

#### What's the symbol for Kelvin?

It's represented by the letter K.
Harlon Moss
Nov 25, 2023

#### How do you convert Celsius to Kelvin?

Add 273.15 to the Celsius temperature.
Sawaira Riaz
Nov 25, 2023

#### Can Kelvin have negative values?

No, Kelvin starts at absolute zero, the lowest limit.
Sawaira Riaz
Nov 25, 2023

#### Why doesn't Kelvin use the degree symbol?

It's an SI unit, which doesn't use degree symbols.
Sara Rehman
Nov 25, 2023

#### Who created the Celsius scale?

It was developed by Anders Celsius, a Swedish astronomer.
Sawaira Riaz
Nov 25, 2023

#### Can you use Kelvin in everyday life?

It's primarily for scientific use, not common in daily activities.
Sawaira Riaz
Nov 25, 2023

#### Do all countries use Celsius for weather reporting?

Most do, except for a few like the U.S., which uses Fahrenheit.
Sara Rehman
Nov 25, 2023

#### How do I convert Kelvin to Celsius?

Subtract 273.15 from the Kelvin temperature.
Sara Rehman
Nov 25, 2023

#### Is the Celsius scale linear?

Yes, it's a linear scale.
Sawaira Riaz
Nov 25, 2023

#### What's common between Celsius and Kelvin?

Both are units of temperature measurement.
Harlon Moss
Nov 25, 2023

#### Are Celsius and Kelvin interchangeable?

No, they require conversion, but are similar in size.
Sawaira Riaz
Nov 25, 2023

#### Is the Kelvin scale linear?

Yes, like Celsius, it's also linear.
Sara Rehman
Nov 25, 2023

#### What's the symbol for Celsius?

The symbol is °C.
Janet White
Nov 25, 2023

#### Is Celsius used in space science?

Kelvin is more common due to its absolute nature.
Janet White
Nov 25, 2023