Temperature is a thermodynamic property of objects. It is an “indirect measure of the kinetic energy of the particles that make up matter” (Lerner 2008). Temperature determines the direction of energy flow between two objects. When brought into contact with each other, the molecules that move faster than the higher temperature object will collide and increase the speed of movement of the molecules that move slower than the lower temperature object. This process stops when both objects have the same average molecular kinetic energies or, in other words, are in thermal equilibrium with each other. Temperature is one of the most commonly measured parameters. The thermometer is a device that has an established temperature scale, based on its expansion property at different temperatures. When the thermometer is in thermal equilibrium with other objects, it indicates the temperature degrees of the objects. Temperature is measured against four temperature scales: Fahrenheit (F), Celsius (C), Kelvin (K), and Rankine (R) temperature scales, whose names are based on the names of the scientists who originated the temperature scales . The Fahrenheit scale, denoted by the letter F, is a non-metric temperature scale, developed in the early 18th century by a German physicist, Daniel Gabriel Fahrenheit (1686-1736). On this scale, the normal freezing point (or ice point) of water is at 32 oF, and the normal boiling point (or vapor point) of water is at 212 oF. Originally, Fahrenheit chose 0°F for the coldest temperature he could get in his laboratory (mixing ice and salt water) and 96°F a "convenient number with many subdivision factors" for the temperature of the human body (Tipler 565). The Celsius scale, indicated with the letter C, is a metric temperature scale, developed in 1742 by an astro...... middle of paper ......the temperature is negative: new record achieved with ultracold gas at high energy." Science News 9 February 2013: 10. Science in Context Web. 25 November 2013. Lerner, Ed. K. Lee and Brenda Wilmoth Lerner. "Temperature". . Science in Context. Web, 24 November 2013. Singh, Onkar. "Zero Law and Thermodynamics". 2007. Science in Context Web. 25 November 2013. Thompson, Ambler and Barry N. Taylor use of the International System of Units). NIST Special Publication 811, 2008. Tipler, Paul Allen and Gene Mosca. "Temperature Theory and Kinetics of Gases." 2008. 565. Print.