Temperature, whats that?

According to Wikipedia: "On the microscopic scale, temperature is defined as the average energy of microscopic motions of a single particle in the system per degree of freedom. On the macroscopic scale, temperature is the unique physical property that determines the direction of heat flow between two objects placed in thermal contact. If no heat flow occurs, the two objects have the same temperature; otherwise heat flows from the hotter object to the colder object.(http://en.wikipedia.org/wiki/Temperature). Temperature is measured with thermometers that may be calibrated to a variety of temperature scales. In most of the world (except for the United States, and a few other countries), the degree Celsius scale is used for most temperature measuring purposes. The entire scientific world (the U.S. included) measures temperature using the Celsius scale and thermodynamic temperature using the Kelvin scale, which is just the Celsius scale shifted downwards so that 0 K= −273.15 C, or absolute zero. (http://en.wikipedia.org/wiki/Temperature)

How to convert between the most common scales

Celcius to Fahrenheit
Celsius [C] = ([F] − 32)  59
Fahrenheit to Celsius
Fahrenheit [F] = [C]  95 + 32 [C]