![]() ![]() The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. Kelvin (for the more scientific among us) Below 20 is cool, below 10 degrees is cold, and below zero degrees means that it will be icy outside as the water will freeze and it will feel very cold outside. Remember that when you see a weather forecast on TV, in a newspaper or on the radio, that anything from 20 degrees upwards is going to be warm, above 25 degrees is hot, above 30 degrees is very hot. If you have to work in hot conditions, here are guidelines for rest periods needed: Temperature So remember not to put water 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. This is important to remember when freezing water in the icebox or freezer, as the water will undoubtedly increase in volume as it freezes, and the colder it gets, the bigger the ice gets. ![]() Its volume will be at its smallest at 4 ☌. *Note that water expands as its temperature increases above 4 degrees, and as it goes colder below 4 degrees. Very cold still but bearable if in lots of warm clothes Very cold if you are outside in this temperature, unbearable to most Here is a table showing some guidelines as to Celsius temperatures: Temperature ☌ Water will always be ice below 0 ☌, liquid from 1 to 99 ☌, and steam from 100 ☌ upwards. below 0 ☌, then we know that it is so cold that water will freeze. This is a very easy system to learn as these two marker points are so easy to remember:Īnd with 100 degrees between those points, we can specify temperatures using 1 or 2 digit positive numbers. It is set so that pure water freezes at zero degrees Celsius and boils at one hundred degrees Celsius. But, for our everyday usage, we use Celsius which is directly related to kelvins. The main SI unit of temperature is the kelvin, which measures absolute temperatures. This is because it is based on the freezing and boiling points of water with 100 degrees between those temperatures. Using the modern Celsius system of temperature measurement, we can easily determine how hot or cold it is. ![]() So, is it cold or hot when the temperature forecast says it will be 5 degrees or it will be 30 degrees? What temperature does water freeze at? Or boil at? What temperature is comfortable for your living room? Temperature is measuring how hot or cold something is, such as the outside air temperature, your body temperature, temperature of water for cooking, boiling, washing, etc. ![]()
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