Temperature is measure how warm or cold miscellaneous is, such as the exterior air temperature, your body temperature, temperature the water for cooking, boiling, washing, etc.

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So, is it cold or warm when the temperature estimate says it will be 5 degrees or it will certainly be 30 degrees? What temperature does water freeze at? Or boil at? What temperature is comfortable for your living room?


Using the contemporary Celsius device of temperature measurement, us can quickly determine how warm or cold it is. The was additionally known together Centigrade. This is because it is based upon the freezing and boiling point out of water with 100 degrees in between those temperatures.

The main SI unit that temperature is the kelvin, which actions absolute temperatures. But, because that our day-to-day usage, we use Celsius i m sorry is straight related come kelvins. It is set so that pure water freezes at zero levels Celsius and also boils in ~ one hundred degrees Celsius.

This is a very easy device to discover as these two marker points space so easy to remember:

Freezing at 0 °C

Boiling at 100 °C

And v 100 degrees between those points, we have the right to specify temperatures using 1 or 2 digit hopeful numbers. When the temperature is negative, i.e. Below 0 °C, climate we know that the is therefore cold that water will freeze. Water will always be ice below 0 °C, fluid from 1 to 99 °C, and heavy steam from 100 °C upwards.

Here is a table showing some guidelines regarding Celsius temperatures:

Temperature °CWhat might be at this temperatureHow the feelsOther points of interest

-30 (that is 30 degrees below zero)

Ice, freezer

Very cold if friend are exterior in this temperature, unbearable come most




Very cold still however bearable if in lots of warm clothes



Water freezes, ice cream melts


Typical coldest median temperature because that UK in winter




Water has its the smallest volume in ~ this temperature*





20Room indoorsWarm
25Warm roomWarm to hot
Typical best temperature because that British summer
30Hot dayFeeling hotTypical temperature because that hotter countries


Body temperature

Very hot

This is the average human body temperature

40Washing an equipment setting for garments for regular washVery hot
If you are outside in this temperature you will feel hot, but an ext so if humidity is high.If your interior body temperature get this level you are in peril of death.
50Extremely hotNot countless places gain this high in temperature, and also this warmth you would need to find shade, drink water and also stay cool.
60Washing an equipment setting for warm wash
Too warm to live inMost bacteria dice at this temperature
90Washing machine setting because that hottest washToo warm to live inHumans cannot endure such high temperatures
100Water boils in the kettle

Water turns to steam
1000Lava from a volcano

1535Melting suggest of iron


15 000 000

Core that the Sun

*Note the water broadens as its temperature increases above 4 degrees, and also as that goes colder listed below 4 degrees. That is volume will be at its the smallest at 4 °C. This is crucial to remember as soon as freezing water in the icebox or freezer, together the water will undoubtedly boost in volume as it freezes, and also the colder it gets, the larger the ice gets. So remember not to placed water into a bottle that will certainly be in the freezer for an ext than a minute or so, as the water inside will expand and break the bottle.

If you need to work in warm conditions, here are guidelines for rest durations needed:

TemperatureRest duration (per hour the work)

30 to 32 ºC

10 minutes

32 to 35 ºC

15 minutes

more than 35 ºC

at least 30 minutes

Remember that once you see a weather estimate on TV, in a newspaper or top top the radio, that anything native 20 degrees upwards is walk to it is in warm, over 25 degrees is hot, above 30 degrees is really hot. Listed below 20 is cool, listed below 10 degrees is cold, and also below zero degrees method that it will certainly be icy external as the water will certainly freeze and it will feel an extremely cold outside.

Kelvin (for the much more scientific among us)

The kelvin (symbol: K) is the SI unit the temperature, and also is among the seven SI base units. That is identified by two facts: zero kelvin is absolute zero (when molecular activity stops), and also one kelvin is the fraction 1/273.16 that the thermodynamic temperature that the triple allude of water (0.01 °C). The Celsius temperature range is now defined in terms of the kelvin.

The kelvin is called after the british physicist and also engineer william Thomson, first Baron Kelvin. Therefore we have one more metric unit named after a brother person. Most metric units room not international at all, unlike °F which is Foreign! The degree Celsius (°C) is named after the swedish astronomer Anders Celsius (1701–1744) but as that is now identified in regards to the kelvin, that is an ext British 보다 Fahrenheit, named after a German scientist.

The native kelvin together an SI unit is correctly written with a lowercase k (unless at the beginning of a sentence), and is never preceded by the words level or degrees, or the price °, unlike Celsius. This is due to the fact that Celsius is a scale of measurement, conversely, the kelvin is a unit the measurement.

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The freezing point of water, as we know from what we review above, is 0 °C, and 0 °C = 273.15 K. Because that every rise by 1 °C the temperature additionally increases by 1 K. Therefore 0 K = -273.15 °C, 100 K = -173.15 °C, 273.15 K = 0 °C, and also the boiling allude of water is 373.15 K (100 °C).