# why do we have different temperature scales

The Fahrenheit Scale The Fahrenheit temperature scale is based on 32 `F for the freezing point of water and 212 `F for the boiling point of water, with the interval between the two being divided into 180 parts. The Celsius Scale The Celsius temperature scale is based on 0 `C for the freezing point and 100 `C for the boiling point of water, with the interval between the two being divided into 100 parts. To convert Fahrenheit to Celsius, use the formula. The Kelvin Scale The solid, liquid, and gaseous phases of water can exist in equilibrium at 273. 16 K (the triple point temperature). The kelvin #1/273. 16#

of the triple point temperature. This makes one kelvin the same size as one Celsius degree. On the Kelvin scale, 0 K represents, the temperature at which the molecules of a substance have their lowest possible energy.

Many physical laws and formulas can be expressed more simply by using the Kelvin scale. Accordingly, the Kelvin scale has become the international standard for scientific temperature measurement. #"K" = "C" + 273. 15#. To convert Kelvin to Celsius, use the formula #"C" = "K" - 273. 15#. Since we're going to be talking about heat, temperatures, and energy, we wanted to introduce you to how temperature is measured. The big three are Fahrenheit, Celsius and Kelvin. Even though scientists may use only a few scales to measure temperature, there are dozens of types of devices that measure temperatures. All of these devices are called thermometers because they measure temperature. There are thermometers to measure your body temperature, the temperature in your oven, and even the temperature of liquid oxygen.

Fahrenheit is the classic English system of measuring temperatures. Water freezes at 32 degrees Fahrenheit and boils at 212 degrees. The scale was created by Gabriel Daniel Fahrenheit in 1724 and divides the difference between the boiling point and freezing point of water into 180 equal degrees. You will probably be asked to convert temperatures back and forth from Fahrenheit to Celsius. Here's the formula: (Fahrenheit-32)*5/9=Celsius. Celsius is the modern system of measuring temperature. It fits in with much of the metric system and has nice round numbers. In Celsius, we call the freezing point of water 0 degrees Celsius, and the boiling point 100 degrees Celsius. Then the scale is divided into 100 equal degrees between those two points.

The scale used to be known as centigrade but the name was changed several years ago. Both Celsius and Fahrenheit are used when discussing our day-to-day weather temperatures. Celsius degrees are larger than Fahrenheit degrees. Kelvin is an important scale used in most of science. The big difference is that it is based on a single point ( absolute zero ) which is given a value of 0 degrees. From there, the scale increases by degrees that are the same size as Celsius degrees. It is a scale that is based on energy content, rather than on arbitrary temperature values like the other two scale (based on water). Water freezes at the value 273. 15 and boils at 373. 15 Kelvin. The word Kelvin comes from Lord Kelvin, who did a lot of work with temperatures.

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