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Latent Heat

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Published in: Physics
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Latent Heat is clearly described

Debasish D / Kolkata

21 years of teaching experience

Qualification: B.Tech/B.E. (Institution of Engineers (India) - 1997), MBA/PGDM (Annamalai University, Chidambaram - 2001)

Teaches: Accountancy, Business Mathematics, Economics, Mathematics, Physics, Statistics, Chemistry, Mechanical, Mechanics

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  1. salanŒs NOILVQNnos
  2. Phascs of Matter e The properties of solids, liquids, and gases differ. e How does matter change state? e Solid e Liquid Gas FOUNDATION STUDIES
  3. Watched Pot e You want to cook a pot of potatoes in boiling water. To use energy most efficiently, you should A) Heat it up quickly and leave it at a full boil B) Heat it up slowly and turn it up to a full boil C) Heat it up quickly and turn it down to simmer D) Heat it up slowly and leave it at a low boil FOUNDATION STUDIES
  4. Encroy of Phasc e Internal energy can be stored as bonds between atoms and molecules. Solids have the strongest bonds Energy required to break them to a liquid O- FOUNDATION STUDIES
  5. 2 [leat of Transformation 80 20 e 120 100 60 40 0 -20 o Water (all liquid) water and 20 100 200 Water and steam Heat added (kcal) 740 heat of fusion heat of vaporization As a system reaches the point of a phase change heat no longer changes the temperature. The heat is used to change the phase. FOUNDATION STUDIES
  6. Latent e The heat of transformation per unit mass is called the latent heat (L). Measured in J/kg e It takes as much energy to melt 1 g of ice as it does to raise the temperature from O oc to 80 oc. Material (f or v) Latent Heat Mercury (f) Lead (f) Uranium (f) Copper (f) Water (f) Oxygen (v) Water (v) 1 1.3 kJ/kg 24.7 kJ/kg 82.8 kJ/kg 205 kJ/kg 334 kJ/kg 213 kJ/kg 2300 kJ/kg FOUNDATION STUDIES
  7. e e e Phasc Diagrams 0.00 0.01 For each temperature and pressure a material is in a specific state. The triple point is uniquely defined for each material. P3 for water is used to define the Kelvin The critical point is where there is no difference between liquid and gas. Solid 218 1.0 0.006 Liquid Vapor I Critical point I Gas I Triple point 100 374 Phase diagram for water FOUNDATION STUDIES
  8. Sublimation e e At low pressures a solid can go directly to a gas and vice versa. This process is called sublimation. Dry ice to gaseous carbon dioxide Water vapor to frost There is a latent heat of sublimation Critical point 73 56 cd 5.11 1 Solid Triple point Liquid Vapor -56.6 20 31 Phase diagram for carbon dioxide FOUNDATION STUDIES
  9. Summer Coolcr e 200 g of ice at -10 oc is added to 1.0 kg of water at 15 oc. e Is there enough ice to cool the water to 0 oc? e e Find the amount of heat needed to bring the ice to 0 oc and melt it. mcAT+ mLf q = 70.9 kJ Find the heat needed to cool the water down to 0 oc. = mcAT 62.8 kJ Yes, there's enough ice. FOUNDATION STUDIES

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