Another physical property of a substance is its temperature.  It is the measure of hotness or coldness expressed in terms of any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow, i.e., from a hotter body (one at a higher temperature) to a colder one (one at a lower temperature).  Three temperature scales are in general use today. The Fahrenheit (ºF) temperature scale is used in the United States and a few other English-speaking countries. The Celsius (ºC) temperature scale is employed in virtually all countries that have adopted
 the metric system of measure and is also widely used in the sciences. The Kelvin (K) scale, an absolute temperature scale, is recognized as the international standard for scientific temperature measurement.
        Absolute Zero is 0 degree Kelvin.  This is the lowest temperature possible, and it is a temperature that has yet to be reached by scientist today.

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