HEAT

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					HEAT
 Heat is a form of energy and is defined as:
                                  "The total kinetic energy of all the
molecules of a body "

SYMBOL
      It is denoted by "Q" or "q"


      UNITS
      (1) Joule
 (2) B.T.U
 (3) Calorie


      CONVERSION
1 B.T.U = 251.996 Cal ( or 252 Cal)
1 calorie = 4.186 Joule ( or 4.2 joule)
FLOW OF HEAT
Natural flow of heat always takes place from a region of high temperature
to a region of lower temperature.
THERMOMETRIC PROPERTIES
Properties of a substance that vary uniformly with the variation in
temperature are referred to as Thermometric properties.
EXAMPLES:
 Volume , Density ,Viscosity , Pressure , Surface Tension , Area

THERMAL EQUILIBRIUM
 When two bodies at different temperatures are brought into thermal
contact , heat flows from hot
 body to cold body till the temperature of both the bodies becomes equal
.This state is referred to as THERMAL EQUILIBRIUM.

TEMPERATURE
"Average kinetic energy of the molecules of a body is called
temperature."

Temperature describes the degree of hotness of a body.
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posted:5/9/2012
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