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Summary

  • Heat is a form of energy
  • Heat can flow from a body to its surroundings by virtue of temperature difference.
  • The degree of hotness or coldness is quantitatively represented as temperature.
  • The Celsius temperature and Fahrenheit temperature are related by
  • The ideal gas equation connecting pressure, volume, absolute temperature is PV = μ RT Where μ is the number of moles and R is the universal constant.
  • The absolute scale temperature or Kelvin scale temperature can be written as TC = T – 273.15
  • The coefficient of linear expansion (ai) and volume expansion (aV ) are defined by the relations,
  • The specific heat capacity of a substance is defined by
  • where m is the mass of the substance andDQ is the heat required to change its temperature by DT.
  • The molar specific heat capacity of a substance is defined by DQ = μ CDT
  • Where μ is the number of moles of the substance.
  • The latent heat of fusion is the heat per unit mass required to change a substance from solid into liquid at the same temperature and pressure. The latent heat of vaporisation is the heat per unit mass required to change a substance from liquid to the vapour state without change in the temperature and pressure.
  • The three modes of heat transfer are conduction, convection and radiation.
  • In conduction, heat is transferred between neighbouring parts of a body through molecular collisions, without any flow of matter
  • Newton's Law of Cooling says that the rate of cooling of a body is proportional to the excess temperature of the body over the surroundings.




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