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

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So, is it cold or hot when the temperature estimate says it will certainly be 5 degrees or it will be 30 degrees? What temperature walk water frozen at? Or cook at? What temperature is comfortable for her living room?


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

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

This is a very easy mechanism to find out as these two marker points space so straightforward to remember:

Freezing at 0 °C

Boiling in ~ 100 °C

And through 100 degrees in between those points, we deserve to specify temperatures utilizing 1 or 2 digit hopeful numbers. As soon as the temperature is negative, i.e. Listed below 0 °C, climate we understand that that is for this reason cold that water will certainly freeze. Water will constantly be ice below 0 °C, fluid from 1 to 99 °C, and heavy steam from 100 °C upwards.

Here is a table mirroring some guidelines as to Celsius temperatures:

Temperature °CWhat could be in ~ this temperatureHow that feelsOther point out of interest

-30 (that is 30 degrees below zero)

Ice, freezer

Very cold if friend are outside in this temperature, unbearable to most




Very cold still yet bearable if in lots of heat clothes



Water freezes, ice melts


Typical coldest mean temperature because that UK in winter




Water has its the smallest volume at this temperature*





20Room indoorsWarm
25Warm roomWarm come hot
Typical maximum temperature for British summer
30Hot dayFeeling hotTypical temperature because that hotter countries


Body temperature

Very hot

This is the average person body temperature

40Washing maker setting for apparel for regular washVery hot
If friend are outside in this temperature you will feel hot, but more so if humidity is high.If your interior body temperature reaches this level you room in danger of death.
50Extremely hotNot countless places obtain this high in temperature, and also this warm you would need to find shade, drink water and stay cool.
60Washing an equipment setting for hot wash
Too warm to live inMost bacteria die at this temperature
90Washing an equipment setting for hottest washToo warm to live inHumans cannot survive such high temperatures
100Water boils in the kettle

Water turns to steam
1000Lava from a volcano

1535Melting suggest of iron


15 000 000

Core of the Sun

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

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

TemperatureRest duration (per hour that work)

30 to 32 ºC

10 minutes

32 to 35 ºC

15 minutes

more 보다 35 ºC

at the very least 30 minutes

Remember that when you check out a weather estimate on TV, in a newspaper or on the radio, that anything indigenous 20 degrees upwards is going to it is in warm, over 25 degrees is hot, over 30 degrees is very hot. Listed below 20 is cool, below 10 degrees is cold, and below zero degrees way that it will certainly be icy exterior as the water will freeze and also it will feel really cold outside.

Kelvin (for the an ext scientific among us)

The kelvin (symbol: K) is the SI unit the temperature, and also is one of the 7 SI base units. That is characterized by two facts: zero kelvin is pure zero (when molecular movement stops), and also one kelvin is the portion 1/273.16 that the thermodynamic temperature that the triple point 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 engineer wilhelm Thomson, 1st Baron Kelvin. For this reason we have one more metric unit named after a brother person. Most metric units are not foreign at all, uneven °F which is Foreign! The degree Celsius (°C) is named after the swedish astronomer Anders Celsius (1701–1744) yet as the is now defined in terms of the kelvin, that is an ext British 보다 Fahrenheit, called after a German scientist.

The indigenous kelvin together an SI unit is correctly written through a small letter k (unless at the start of a sentence), and is never ever preceded through the words degree or degrees, or the prize °, uneven Celsius. This is due to the fact that Celsius is a range of measurement, conversely, the kelvin is a unit the measurement.

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The freezing point of water, together we know from what we check out above, is 0 °C, and also 0 °C = 273.15 K. For every boost by 1 °C the temperature additionally increases by 1 K. Thus 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).