Temperature

Defining temperature

Temperature is measure of average kinetic energy of the particles in a system. Difference between temperature and heat is that heat is the sum of all the kinetic energies of the particles in a system. Adding heat to a system causes its temperature to rise. Newton's zeroth law states that a system reaches a thermal equilibrium when there is no observable change in temperature between a system. Therefore, the change in temperature causes heat to flow from a high temperature system to a low temperature system.

Measurement

Temperature can be measured in numbers by three temperature scales: Celsius, Fahrenheit, and Kelvin. Celsius scale sets freezing point of the water at zero and boiling point at 100, and Fahrenheit scale sets freezing point of the water at 32 degrees and boiling point of the water at 212 degrees. Kelvin scale is designed to go to zero at absolute zero, the minimum temperature.

A Mathematical Model

The relationship between heat transfer and temperature can be modeled with this equation:

Q = m c Delta T

The relationship between temperature scales:

(degrees)K = 273.15 + (degrees)C        (degrees)C = (5/9)*(oF-32)        (degrees)F = (9/5)*(degrees)C+32

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