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Temperature is a physical quantity expressing a system if that system is warmer or cooler. Thus, a material with high temperature is warmer and the cooler by a low temperature. It indicates how fast the atoms that make up a substance that moves, for heating their speed increased. Scientists say that at a very low temperature, called absolute zero, the atoms or molecules movement would cease completely. Temperature with light part of ecological factors. Temperature is a fundamental parameter which characterize the thermal condition of a body, more specifically, the state of thermodynamic equilibrium.

State of thermodynamic equilibrium conditions are expressed by the two postulates of thermodynamics: -First postulated, called the general principle of thermodynamics, it means that an isolated system always reach, after a time, in a state of thermodynamic equilibrium and can not out alone by itself in this state: According to this postulate, if the remote system is removed from a state of thermodynamic equilibrium, it will return to steady state conditions after a period of time, called the relaxation time. The second postulate, called the zeroth law of thermodynamics, the system specifies the property in a state of thermodynamic equilibrium, the two equivalent formulas: Any size of a system that in the state of thermodynamic equilibrium conditions can be determined based on the external condition parameters the size of the system and the internal state of the system characterized called two systems thermodynamic temperature in thermal equilibrium with a third system are in equilibrium with each other.