A1 noun Neutral #1,183 most common

Celsius

/ˈsɛlsiəs/

A scale of temperature measurement where water freezes at 0 degrees and boils at 100 degrees. It is the standard unit of temperature used in most countries and scientific contexts globally.

Examples

3 of 5
1

The weather forecast says it will be 25 degrees Celsius tomorrow.

The weather forecast says it will be 25 degrees Celsius tomorrow.

2

The experiment requires the solution to be kept at exactly 37 degrees Celsius.

The experiment requires the solution to be kept at exactly 37 degrees Celsius.

3

It's about 30 Celsius outside, so wear a hat!

It's about 30 Celsius outside, so wear a hat!

Word Family

Noun
Celsius
Adjective
Celsius
Related
degree
💡

Memory Tip

Think of the 'C' in Celsius as standing for 'Centigrade' (100 steps) or 'Cold' (0 degrees is cold/freezing).

Quick Quiz

Water freezes at zero degrees ___.

Correct!

The correct answer is: Celsius

Examples

1

The weather forecast says it will be 25 degrees Celsius tomorrow.

everyday

The weather forecast says it will be 25 degrees Celsius tomorrow.

2

The experiment requires the solution to be kept at exactly 37 degrees Celsius.

formal

The experiment requires the solution to be kept at exactly 37 degrees Celsius.

3

It's about 30 Celsius outside, so wear a hat!

informal

It's about 30 Celsius outside, so wear a hat!

4

Under standard atmospheric pressure, water boils at 100 degrees Celsius.

academic

Under standard atmospheric pressure, water boils at 100 degrees Celsius.

5

The server room temperature must not exceed 22 degrees Celsius for optimal performance.

business

The server room temperature must not exceed 22 degrees Celsius for optimal performance.

Word Family

Noun
Celsius
Adjective
Celsius
Related
degree

Common Collocations

degrees Celsius degrees Celsius
below zero Celsius below zero Celsius
the Celsius scale the Celsius scale
Celsius reading Celsius reading
zero degrees Celsius zero degrees Celsius

Common Phrases

in Celsius

measured using the Celsius scale

degrees above zero

positive temperatures on the Celsius scale

converted to Celsius

changed from another scale to Celsius

Often Confused With

Celsius vs Fahrenheit

Celsius is based on 0 for freezing water, while Fahrenheit uses 32 for freezing water.

Celsius vs Centigrade

Centigrade is the older name for the Celsius scale; they refer to the same measurement.

📝

Usage Notes

Celsius should always be capitalized because it is named after Anders Celsius. It is almost always used with the word 'degrees'.

⚠️

Common Mistakes

Learners often forget to capitalize the 'C' or misspell it as 'Celsis'. They may also confuse the boiling and freezing points with the Fahrenheit scale.

💡

Memory Tip

Think of the 'C' in Celsius as standing for 'Centigrade' (100 steps) or 'Cold' (0 degrees is cold/freezing).

📖

Word Origin

Named after the Swedish astronomer Anders Celsius (1701–1744), who invented the scale.

Grammar Patterns

Used as a proper noun and an adjective Often follows a numerical value and the word 'degrees' Does not change form in the plural (degrees Celsius)
🌍

Cultural Context

Celsius is used by the vast majority of the world, while the US and a few other countries primarily use Fahrenheit.

Quick Quiz

Water freezes at zero degrees ___.

Correct!

The correct answer is: Celsius

More Weather words

windy

A1

Windy is an adjective used to describe weather conditions where there is a lot of strong, moving air. It characterizes a day or a place where the wind is blowing harder than usual, often making it feel colder or causing objects to move.

foggy

A1

Foggy is an adjective used to describe weather where there is a thick cloud of tiny water droplets near the ground. It makes it very difficult to see things that are far away or even close by.

stormy

A1

Describes weather that is characterized by strong winds, heavy rain, and often thunder or lightning. It can also refer to a situation or relationship marked by strong conflict or angry arguments.

overcast

A1

An overcast is a condition where the entire sky is covered with clouds and no sun can be seen. It describes a grey and dull sky that often happens before rain or during cold days.

cool

A1

Describes a temperature that is moderately cold, typically in a way that is pleasant or refreshing. It is used to describe weather that is neither hot nor very cold, often requiring a light jacket.

freezing

A1

Freezing refers to the temperature at which water turns into ice, which is 0°C or 32°F. It describes the process or the state of the weather when it is cold enough for liquid to become solid.

humid

A1

Humid describes air that feels wet, damp, and sticky because it contains a lot of water vapor. It is often used to describe hot weather that makes you feel sweaty.

wet

A1

Describes something that is covered in or full of water or another liquid. In the context of weather, it refers to a day or period when it is raining.

mild

A1

Mild describes weather that is warmer than usual for a specific time of year, especially in winter or autumn. It means the temperature is moderate and pleasant, rather than being very cold or freezing.

rain

A1

Rain is water that falls from clouds in the sky in small drops. It is a natural weather event that provides water for plants and fills rivers and lakes.

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