Temperature: 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 body (one at a lower temperature).
Temperature is not the equivalent of the energy of a thermodynamic system; e.g., a burning match is at a much higher temperature than an
iceberg, but the total heat energy contained in an iceberg is much greater than the energy contained in a match. Temperature, similar to
pressure or density, is called an intensive property—one that is independent of the quantity of matter being considered—as distinguished
from extensive properties, such as mass or volume.
Three temperature scales are in general use today. The Fahrenheit (°F) temperature scale is used in the United States and a few other
English-speaking countries. The Celsius (°C) temperature scale is standard in virtually all countries that have adopted the metric system
of measurement, and it is widely used in the sciences. The Kelvin (K) scale, an absolute temperature scale (obtained by shifting the Celsius
scale by −273.15° so that absolute zero coincides with 0 K), is recognized as the international standard for scientific temperature measurement.
https://www.britannica.com/science/temperature
