Temperature
Temperature is one of the fundamental quantities. During the day we feel hot, but cool at night. Fire is hot, but ice is cold. A hot object is said to have high temperature, but a cold object has low temperature. Thus temperature shows the degree of hotness and coldness of an object. Your palm can feel the hotness or coldness of a thing. But can you use it to measure temperature?
The common measuring tool for temperature is a thermometer. A thermometer consists of a long glass tube with a narrow column, called capillary pipe, containing liquid, alcohol or mercury. But, the upper part is vacuum.
To make the measurement easy to read, the glass has scale. Not all thermometers use the same scale. People know degree Centigrade (oC), Fahrenheit (oF), and Kelvin (K). The comparison between Fahrenheit and Celsius is shown in Figure 1.9.
Tf = 9/5 Tc + 32

The comparison in Figure 1.9 can be stated as:

Tk = Tc + 273
Where TF and Tc is a temperature stated in Fahrenheit (oF) and Celsius (oC). The equation used to convert Kelvin scale to Celsius scale is given by:

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