TEMPERATURE We can consider the
TEMPERATURE of a body as being the measure of the degree of agitation of its molecules. Of
this form, assuming not to have phase change, when the body receives energy thermal, its molecules pass if to agitate more intensely: the
temperature increases. When losing energy, the molecules of the body if agitate with lesser intensity: the temperature diminishes. The heat transference enters two bodies can be explained through the difference between its
temperatures. Thus, if two bodies the different temperatures will be placed in presence, the slow molecules of the cold body increase its speed and the fast molecules of the hot body have its speed diminished until being reached a balance. In other words, it had a ticket of thermal energy (heat) of the body hottest for the body most cold. The final situation of balance that translates an equality of temperature of the body politics the thermal balance. Thus, two bodies in thermal balance possess equal temperatures obligatorily. The comment allows to conclude: "se two bodies are in thermal balance with one third, they are in thermal balance between si". This fact is known as Law Zero of the Thermodynamics. Thus, if a body It is in thermal balance with a body C, and a body B also is in thermal balance with body C, the bodies and B is in thermal balance between itself.