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specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
specific heat capacity
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specific heat capacity

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  • 1. Present by: ‘izzat najmi bin ibrahimNoor fatinah binti muhd rusli Punitha A/P Nagappan
  • 2. DEFINITITION A materials heat capacity is a measure of how much energy must be exchanged between an object and its environment to produce a change in temperature. In other words, it is a measure of an objects "capacity" to hold "heat." Materials with high heat capacities, such as water, require large amounts of energy to produce a small temperature change. Heat Capacity Heat capacity is the amount of heat required to increase the temperature of an object by 1 oC (or 1 K).
  • 3. TYPE OF HEAT CAPACITY Molar heat capacity Specific heat Heat capacity
  • 4. FORMULA OF SPECIFIC HEAT CAPACITY
  • 5. EXAMPLEHow much thermal energy is required to raise the temperature of a 2 kg aluminium block from 25 C to 30 C? [The specific heat capacity of aluminium is 900 Jkg-1 oC-1]Answer:Mass, m = 2kg Specific heat capacity, c = 900 Jkg-1 oC-1 Temperature change, θ = 30 - 25 = 5 oCThermal energy required, Q = mcθ = (2)(900)(5) = 9000J.
  • 6. CONVERSION OF ELECTRICAL ENERGY INTOTHERMAL ENERGY
  • 7. EXAMPLE A lead shot of mass 5g is placed at the bottom of a vertical cylinder thatis 1m long and closed at both ends. The cylinder is inverted so that the shotfalls 1 m. By how much will the temperature of the shot increase if thisprocess is repeated 100 times? [The specific heat capacity of lead is130Jkg-1K-1] Answer: m = 5gh = 1m × 100 = 100mg = 10 ms-2c = 130Jkg-1K-1θ=? In this case, the energy conversion is from potential energy to heatenergy. We assume that all potential energy is converted into heat energy.Therefore mgh = mcθgh = cθ
  • 8. CONVERSION OF GRAVITATIONAL ENERGY INTOTHERMAL ENERGY
  • 9. CONVERSION OF KINETIC ENERGY INTOTHERMAL ENERGY
  • 10. MIXING 2 LIQUID
  • 11. EXAMPLEExample 4What will be the final temperature if 500 cm3 of water at 0 �C is added to 200cm3 of water at 90 �C? [Density of water = 1gcm-3]Answer:The density of water is 1g/cm3, which means the mass of 1 cm3 of water is equal to 1g.Let the final temperature = θ m1 = 500g = 0.5kg c1 = c θ1 = θ - 0 = θ m2 = 200g = 0.2kg c2 = c θ2 = 90 - θm1c1θ1 = m2c2θ2 (0.5) c ( θ ) = (0.2) c ( 90 - θ ) 0.5 θ = 18 - 0.2 θ 0.5 θ + 0.2 θ = 18 0.7 θ = 18 θ = 25.71 oC
  • 12. THE END

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