HAPTER LEVEN - NCERT

CHAPTER ELEVENTHERMAL PROPERTIES OF INTRODUCTIONWe all have common sense notions of heat and is a measure of hotness of a body. A kettlewith boiling water is hotter than a box containing ice. Inphysics, we need to define the notion of heat, temperature,etc., more carefully. In this chapter, you will learn what heatis and how it is measured, and study the various proceses bywhich heat flows from one body to another. Along the way,you will find out why blacksmiths heat the iron ring beforefitting on the rim of a wooden wheel of a horse cart and whythe wind at the beach often reverses direction after the sungoes down.

ther mometer is put in slightly warm water. If we take out the thermometer from the warm Fig. 11.2Pressure versus temperature of a low density gas kept at constant volume. Fig. 11.3A plot of pr essure versus temperatur e and extrapolation of lines for low density gases indicates the same absolute zero temperature.

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  Thermometer, Herts, Thermom eter, Mometer

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