Temperature is measuring how hot or cold something is, such as the external air temperature, her body temperature, temperature of water for cooking, boiling, washing, etc.

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So, is that 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 cook at? What temperature is comfortable for your living room?


Using the modern-day Celsius mechanism of temperature measurement, we can quickly determine how hot or cold it is. The was also known together Centigrade. This is because it is based on the freezing and also boiling point out of water through 100 degrees between those temperatures.

The main SI unit that temperature is the kelvin, which measures absolute temperatures. But, for our everyday usage, we use Celsius i m sorry is straight related come kelvins. The is collection so that pure water freezes in ~ zero levels Celsius and also boils in ~ one hundred degrees Celsius.

This is a very easy system to learn as these two marker points space so easy to remember:

Freezing at 0 °C

Boiling in ~ 100 °C

And with 100 degrees in between those points, we deserve to specify temperatures making use of 1 or 2 digit positive numbers. When the temperature is negative, i.e. Listed below 0 °C, climate we know that that is for this reason cold that water will freeze. Water will always be ice below 0 °C, fluid from 1 come 99 °C, and vapor from 100 °C upwards.

Here is a table mirroring some guidelines regarding Celsius temperatures:

Temperature °CWhat can be at this temperatureHow that feelsOther points of interest

-30 (that is 30 degrees below zero)

Ice, freezer

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




Very cold still yet bearable if in too many of warm clothes



Water freezes, ice melts


Typical coldest mean temperature for UK in winter




Water has its the smallest volume at this temperature*





20Room indoorsWarm
25Warm roomWarm come hot
Typical maximum temperature because that 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 clothing for common 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 get this level you space in risk of death.
50Extremely hotNot many places get this high in temperature, and this warmth you would require to uncover shade, drink water and also stay cool.
60Washing machine setting for hot wash
Too warm to live inMost bacteria dice at this temperature
90Washing machine setting for hottest washToo hot to live inHumans cannot make it through such high temperatures
100Water boils in the kettle

Water turns to steam
1000Lava indigenous a volcano

1535Melting point of iron


15 000 000

Core the the Sun

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

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

TemperatureRest duration (per hour that work)

30 to 32 ºC

10 minutes

32 come 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, the anything native 20 degrees upwards is walking to it is in warm, above 25 degrees is hot, above 30 degrees is an extremely hot. Below 20 is cool, listed below 10 degrees is cold, and below zero degrees means that it will be icy exterior as the water will certainly freeze and also it will feel an extremely cold outside.

Kelvin (for the more scientific amongst us)

The kelvin (symbol: K) is the SI unit the temperature, and is among the seven SI basic units. The is characterized by 2 facts: zero kelvin is pure zero (when molecular motion stops), and one kelvin is the fraction 1/273.16 the the thermodynamic temperature the the triple suggest of water (0.01 °C). The Celsius temperature scale is now identified in regards to the kelvin.

The kelvin is named after the brothers physicist and also engineer wilhelm Thomson, 1st Baron Kelvin. Hence we have another metric unit called after a british person. Most metric units space not foreign at all, unlike °F i m sorry is Foreign! The degree Celsius (°C) is called after the swedish astronomer Anders Celsius (1701–1744) but as that is now characterized in regards to the kelvin, the is more British 보다 Fahrenheit, named after a German scientist.

The indigenous kelvin together an SI unit is effectively written through a small letter k (unless in ~ the start of a sentence), and also is never ever preceded by the words level or degrees, or the symbol °, uneven Celsius. This is because Celsius is a range of measurement, whereas the kelvin is a unit the measurement.

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The freezing allude of water, together we recognize from what we review above, is 0 °C, and 0 °C = 273.15 K. For every boost by 1 °C the temperature likewise increases through 1 K. Thus 0 K = -273.15 °C, 100 K = -173.15 °C, 273.15 K = 0 °C, and the boiling suggest of water is 373.15 K (100 °C).