Temperature is measuring how hot or cold other is, such together the exterior air temperature, her body temperature, temperature of water for cooking, boiling, washing, etc.

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


Using the contemporary Celsius system of temperature measurement, we can easily determine how warm or cold that is. It was also known as Centigrade. This is because it is based upon the freezing and also boiling point out of water v 100 degrees between those temperatures.

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

This is a very easy device to find out as these 2 marker points space so basic to remember:

Freezing at 0 °C

Boiling in ~ 100 °C

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

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

Temperature °CWhat could be in ~ this temperatureHow it feelsOther clues of interest

-30 (that is 30 degrees below zero)

Ice, freezer

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




Very cold still however bearable if in too many of heat clothes



Water freezes, ice melts


Typical coldest median temperature because that UK in winter




Water has actually its the smallest volume in ~ this temperature*





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


Body temperature

Very hot

This is the average human body temperature

40Washing machine setting for clothing for regular washVery hot
If girlfriend are outside in this temperature you will feel hot, but much more so if humidity is high.If your inner body temperature reaches this level you space in peril of death.
50Extremely hotNot many places obtain this high in temperature, and also this warm you would require to discover shade, drink water and stay cool.
60Washing maker setting for warm wash
Too hot to live inMost bacteria dice at this temperature
90Washing maker setting because that hottest washToo hot to live inHumans cannot make it through such high temperatures
100Water boils in the kettle

Water transforms to steam
1000Lava indigenous a volcano

1535Melting suggest of iron


15 000 000

Core that the Sun

*Note that water increases as that is temperature increases above 4 degrees, and as it goes colder below 4 degrees. Its volume will certainly be at its smallest at 4 °C. This is necessary to remember as soon as freezing water in the icebox or freezer, together the water will undoubtedly boost in volume together it freezes, and also the cooler it gets, the bigger the ice cream gets. So remember no to put water into a party that will certainly be in the freezer for much more than a minute or so, together the water inside will certainly expand and also break the bottle.

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

TemperatureRest period (per hour of 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 view a weather forecast on TV, in a newspaper or top top the radio, the anything native 20 degrees upwards is going to be warm, over 25 degrees is hot, above 30 degrees is an extremely hot. Listed below 20 is cool, listed below 10 degrees is cold, and below zero degrees way that it will be icy exterior as the water will freeze and it will feel an extremely 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 seven SI base units. That is defined by 2 facts: zero kelvin is pure zero (when molecular activity stops), and 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 regards to the kelvin.

The kelvin is called after the brothers physicist and also engineer william Thomson, 1st Baron Kelvin. Hence we have one more metric unit called after a brothers person. Most metric units space not international at all, unequal °F which is Foreign! The degree Celsius (°C) is called after the swedish astronomer Anders Celsius (1701–1744) yet as that is now defined in regards to the kelvin, it is much more British than Fahrenheit, named after a German scientist.

The native kelvin together an SI unit is properly written with a small letter k (unless in ~ the start of a sentence), and is never ever 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, whereas the kelvin is a unit that measurement.

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The freezing suggest of water, as we understand from what we review above, is 0 °C, and 0 °C = 273.15 K. Because that every rise by 1 °C the temperature likewise 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).