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INTRODUCTION

Heat is a form of energy that produces the sensation of hotness. Thermodynamics is the branch of physics that deals with the energy relationships involving heat, mechanical energy and other forms of energy.

Generally, heat is anything that provides warmth but scientifically, heat is the flow of energy from a warmer object to a cooler object in comparison till both the objects attain equilibrium.

Heat energy flows due to the difference in temperature of the two bodies. Heat transfer occurs until the bodies attain equilibrium.

Temperature is defined as the kinetic energy of molecules of a body. It is the measure of  degree of hotness or coldness of a body. .

Because temperature is a relative measurement, scales based on reference points must be used to accurately measure temperature. There are three main scales commonly used in the world today to measure temperature: the Fahrenheit (°F) scale, the Celsius (°C) scale, and the Kelvin (K) scale.

On the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees. On the Celsius scale, which is common in most other places in the world, water freezes at 0 degrees and boils at 100 degrees.

The scientific standard, however, is the Kelvin scale,  also known as the absolute scale temperature and is measured from absolute zero (0 K).While the size of an increment on the Kelvin scale is the same as the size of a degree on the Celsius scale, its 0 value is set at a different place. 0 Kelvin is equal to -273.15 degrees Celsius. Each of these scales uses a different set of divisions based on different reference points.