Temperature is measuring how warm or cold something is, such together the outside 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 does water frozen at? Or cook at? What temperature is comfortable for your living room?


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

The main SI unit of temperature is the kelvin, which actions absolute temperatures. But, for our everyday usage, we use Celsius i m sorry is directly related come kelvins. It is collection so the pure water freezes at zero levels Celsius and boils at one hundred degrees Celsius.

This is a an extremely easy device to learn as these 2 marker points are so basic to remember:

Freezing at 0 °C

Boiling at 100 °C

And with 100 degrees between those points, we have the right to specify temperatures utilizing 1 or 2 digit optimistic numbers. Once the temperature is negative, i.e. Below 0 °C, then we recognize that the is for this reason cold the water will freeze. Water will always be ice below 0 °C, liquid from 1 come 99 °C, and steam from 100 °C upwards.

Here is a table reflecting some guidelines regarding Celsius temperatures:

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

-30 (that is 30 degrees listed below zero)

Ice, freezer

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




Very cold still but bearable if in lots of warm clothes



Water freezes, ice melts


Typical coldest typical temperature for UK in winter




Water has actually its the smallest volume at this temperature*





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


Body temperature

Very hot

This is the average person body temperature

40Washing machine setting for apparel for common washVery hot
If you are outside in this temperature you will certainly feel hot, but an ext so if humidity is high.If your internal body temperature get this level you space in risk of death.
50Extremely hotNot countless places get this high in temperature, and this warm you would need to discover shade, drink water and stay cool.
60Washing machine setting for warm wash
Too warm to live inMost bacteria die at this temperature
90Washing an equipment setting for hottest washToo hot to live inHumans cannot make it through such high temperatures
100Water boils in the kettle

Water transforms to steam
1000Lava from a volcano

1535Melting allude of iron


15 000 000

Core the the Sun

*Note the water expands as its temperature increases above 4 degrees, and as that goes colder below 4 degrees. Its volume will be in ~ its the smallest at 4 °C. This is crucial to remember when freezing water in the icebox or freezer, together the water will certainly undoubtedly rise in volume as it freezes, and the cooler it gets, the enlarge the ice gets. For this reason remember no to placed water into a bottle that will certainly be in the freezer for more than a minute or so, together the water inside will certainly expand and break the bottle.

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

TemperatureRest duration (per hour the work)

30 come 32 ºC

10 minutes

32 come 35 ºC

15 minutes

more than 35 ºC

at the very least 30 minutes

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

Kelvin (for the an ext scientific among us)

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

The kelvin is called after the brother physicist and also engineer wilhelm Thomson, 1st Baron Kelvin. For this reason we have an additional metric unit named after a brother person. Many metric units are not foreign at all, uneven °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 more British than Fahrenheit, named after a German scientist.

The native kelvin as an SI unit is properly written v a lowercase k (unless in ~ the beginning of a sentence), and is never ever preceded through the words degree or degrees, or the symbol °, unequal Celsius. This is because Celsius is a range of measurement, vice versa, the kelvin is a unit of measurement.

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The freezing suggest of water, as we recognize from what we read above, is 0 °C, and also 0 °C = 273.15 K. Because that every increase 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 the boiling point of water is 373.15 K (100 °C).