Specific Heat Capacity

Specific Heat Capacity

• If a system undergoes a change of temperature from T to T+ΔT during the transfer of ΔQ amount of heat then heat capacity c of the system is defined as the ratio of
  $$c=\frac{\Delta Q}{\Delta T}$$
  
• Thus Heat capacity per unit mass of a substance is its specific heat capacity. $$c=\frac{\Delta Q}{m\Delta T}$$
  

  where,
  m - mass of the substance
  ΔQ - Heat absorbed or rejected by the substance
  ΔT - Change in Temperature
  
  

• Specific heat capacity depends on the nature of substance.
  
• It is constant characteristics of the substance and is independent of the amount of substance.
  
• It also depends on the temperature of the substance
  
• Its unit is J Kg^-1 K^-1
  
• If the amount of substance is specified in terms of numbers of moles n instead of mass m then the heat capacity per mole of the substance is
  $$=\frac{\Delta Q}{n\Delta T}$$
  

  and is known as Molar Specific Heat capacity.
  

  
  
  
• It is constant characteristics of the substance and independent of the amount of substance
  
• It depends on the nature of the substance ,temperature and amount of heat supplied
  
• Its unit is J mol^-1 K^-1
  
• In case of gases , when a gas is heated, ordinarily there is change in volume as well as pressure in addition to change in temperature
  
• For simplicity either volume or pressure can be kept constant.Thus gas have two specific heat capacities
  1) Specific heat capacity at constant volume C_V
  2) Specific heat capacity at constant pressure C_P
  

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• Notes
  • Concept of Heat and Temperature
  • Zeroth Law of Thermodynamics
  • Measurement of temperature
  • Ideal Gas Equation and Absolute Temperature
  • Thermal Expansion
  • Thermal stress
  • Specific Heat Capacity
  • Calorimetry
  • Change of phases & Latent Heat
  • Solved Examples of Thermal Properties
• Assignments
  • Thermal Properties of Matter Problems
  • Thermal Properties of Matter Multiple Choice Questions
  • Thermal Expansion and Thermal Stress Questions
• Revision Notes
  • Thermal Properties Of matter revision PDF

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