Heat Energy Measurement(Physics)

• Heat is a form a form of energy that depends on temperature differences. It is measured in Joules (J)
• Latent heat is the amount of energy needed to change the state of matter without changing its temperature.
• Specific heat capacity is the amount of heat or energy required to raise the temperature of one kilogram of a substance through one degree Celsius or one Kelvin.
• Specific heat capacity= Q=MC△θ where,

  Q= quantity of heat energy (J)

  M= Mass

  △θ= Rise in temperature (θ2-θ1) (K)
• C = specific heat capacity of material
• Q = quantity of heat energy transferred
• Specific heat capacity(C) is measured in J/KgK
• Heat capacity is the quantity of heat required to change the temperature of a body by 1K
• The heat capacity is proportional to the mass of the body also the nature of the body.
• Heat capacity is measured in J/K
• Note: when quantity of heat is related to other forms of energy

  Q=MC△θ (S.H.C)

  Q= mgh (P.E)

  Q= 1/2mv^2 (K.E)

  Q= pt (Power/workdone)

  Q= IVT ( Electricity)
• A calorimetre is a instrument used to measure heat energy.
• A calorimeter usually consits of a vessel and a stirrer both made of copper and Aluminium and the caalorimeter is usually in a wooden frame to prevent heat exchange in the surrounding either by conjuction or radiation the process of shielding the container is called laggin
• The principle of calorimetry states that in a thermally isolated system heat lost by hot objects equals to heat gained by cold objects
• Determination of specific heat capacity of a liquid by method of mixture

  1. mass of calorimeter + stirrer (m1)
  2. mass of calorimeter + stirrer + liquid (m2)
  3. mass of liquid (m2-m1)
  4. mass of solid (m3)
  5. S.H.C of calorimeter (c1)
  6. S.H.C of liquid (c2)
  7. S.H.C of solid (c3)
  8. Initial temperature of liquid and calorimeter (θ1)
  9. initial temperature of solid in boiling water (θ2)
  10. final temperature of mixture (θ)