What Is Celsius In Science?

Celsius is a scale used in science to measure temperature it is based on 0 degrees being the freezing point of  water and 100 degrees the boiling point!

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In science there basically 3 scales that relate temperature. Temperature can be defined as a relative measure of kinetic energy of molecules in motion.
 
The 3 scales used to measure kinetic energy of molecules are as follows:
 
Fahrenheit, Celsius and Kelvin. The last of these scales, Kelvin is use by professionals involved in research therefore do not be too concerned with Kelvins. Just for your information K=C+273.
 
For the first 2 scales, F=1.8C+32 and C=F-32/1.8, and are therefore inter-related. Because all 3 scales can be used to measure heat all three are important, however, Fahrenheit and Celsius and the most frequently used.  
As you will discover from the answers below from Bifmeister the Celcius scale can be used to measure boiling and freezing points, as both the F and C scales are mere off set scales of each other as indicated by the equations above the Fahrenheit scale can used interchangeably with the Celsius scale, both scales are used to determine boiling and freezing points of a substance.
 
If my explanation does not answer your question or you are confused, please post another question.

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Celsius is a name given to the Centigrade scale, but is now more carefully defined between absolute zero and the triple point of a special preparation of very pure distilled water.  Because of this definition, the boiling point of water (at a standard temperature and pressure) is not exactly 100C, but  by an international agreement made in 1954, it is actually 99.9839 C.  But for most purposes this is equal to 100C, unless you're a scientist dealing with very small errors of measurement.

I learned a lot answering this question.  Thanks for asking.  It seems that nothing is easy anymore!

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It is a temperature that is usually related to freezing temperatures.

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