Temperature is measure how hot or cold other is, such as the external air temperature, her body temperature, temperature of water because that cooking, boiling, washing, etc.

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


Using the modern-day Celsius system of temperature measurement, us can conveniently determine how hot or cold that is. It was additionally known together Centigrade. This is due to the fact that it is based on the freezing and boiling clues of water v 100 degrees between those temperatures.

The main SI unit of temperature is the kelvin, which procedures absolute temperatures. But, because that our everyday usage, we usage Celsius i beg your pardon is straight related come kelvins. It is set so the pure water freezes in ~ zero degrees Celsius and boils in ~ one hundred degrees Celsius.

This is a an extremely easy device to discover as these two marker points room so basic to remember:

Freezing in ~ 0 °C

Boiling at 100 °C

And through 100 degrees in between those points, we can specify temperatures using 1 or 2 digit positive numbers. Once the temperature is negative, i.e. Below 0 °C, climate we recognize that that is so cold that water will certainly freeze. Water will constantly be ice listed below 0 °C, liquid from 1 to 99 °C, and vapor from 100 °C upwards.

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

Temperature °CWhat could be at this temperatureHow it feelsOther point out of interest

-30 (that is 30 degrees listed below zero)

Ice, freezer

Very cold if you are exterior in this temperature, unbearable to most




Very cold still however bearable if in lots of warmth 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 come 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 being body temperature

40Washing device setting for clothes for normal washVery hot
If girlfriend are outside in this temperature you will feel hot, but an ext so if humidity is high.If your internal body temperature will this level you space in peril of death.
50Extremely hotNot numerous places acquire this high in temperature, and this warm you would need to find shade, drink water and also stay cool.
60Washing machine setting for warm wash
Too hot to live inMost bacteria dice at this temperature
90Washing machine setting for hottest washToo hot to live inHumans cannot endure such high temperatures
100Water boils in the kettle

Water turns to steam
1000Lava from a volcano

1535Melting point of iron


15 000 000

Core the the Sun

*Note the water increases as that is temperature increases over 4 degrees, and as the goes colder below 4 degrees. That volume will certainly be in ~ its the smallest at 4 °C. This is vital to remember when freezing water in the icebox or freezer, together the water will undoubtedly boost in volume together it freezes, and also the colder it gets, the larger the ice gets. Therefore remember no to put water right into a bottle that will be in the freezer for more than a minute or so, as the water inside will expand and break the bottle.

If you have to work in hot conditions, right here are guidelines because that rest periods needed:

TemperatureRest period (per hour that work)

30 to 32 ºC

10 minutes

32 to 35 ºC

15 minutes

more than 35 ºC

at least 30 minutes

Remember that as soon as you check out a weather forecast on TV, in a newspaper or top top the radio, that anything from 20 degrees upwards is walk 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 method that it will be icy exterior as the water will freeze and it will certainly feel an extremely cold outside.

Kelvin (for the much more scientific amongst us)

The kelvin (symbol: K) is the SI unit the temperature, and also is among the seven SI base units. That is identified by 2 facts: zero kelvin is pure zero (when molecular activity stops), and also one kelvin is the fraction 1/273.16 the the thermodynamic temperature that the triple point of water (0.01 °C). The Celsius temperature scale is now defined in terms of the kelvin.

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

The word kelvin together an SI unit is appropriately written v a lowercase k (unless at the start of a sentence), and is never ever preceded by the words degree or degrees, or the price °, unlike Celsius. This is due to the fact that Celsius is a scale of measurement, whereas the kelvin is a unit of measurement.

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The freezing point of water, as we recognize from what we review above, is 0 °C, and also 0 °C = 273.15 K. Because that every increase by 1 °C the temperature additionally increases through 1 K. For this reason 0 K = -273.15 °C, 100 K = -173.15 °C, 273.15 K = 0 °C, and also the boiling suggest of water is 373.15 K (100 °C).