Lecture 22_Chapter10

# Lecture 22_Chapter10 - Home Work: Chapter 10 Lecture 22:...

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1 Lecture 22: Chapter 10 Heat Transfer and Change of Phase ! Conduction, Convection, Radiation ! Four Phases of Matter Home Work: Chapter 10 " Key Terms " Review questions:1, 2, 9, 10, 12, 15, 16 " Exercises: 1, 4, 5, 8, 12, 16 Thermodynamics and its laws " First Law: " Whenever heat flows into or out of a system, the gain or loss of thermal energy equals the amount of heat transferred. " Second Law: " Heat never spontaneously flows from a cold substance to a hot substance. " Third Law: " No system can reach absolute zero. Question: If you hold one end of a metal nail against a piece of ice, the end in your hand soon become cold. Does cold flow from the ice to your hand? Answer: Energy flows from higher to lower temperature , from your hand to the ice . It is the thermal energy flowing from your hand that produces the sensation of coolness.

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2 What are the main mechanisms of heat transfer? " 1. Conduction " 2. Convection " 3. Radiation Conduction " Heat conduction occurs by means of loosely bound particles in materials, mainly electrons . Good conductors . Metals have the loosest electrons and they are excellent conductors! " Silver is the best, then copper, aluminum, iron, etc.
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## This note was uploaded on 05/27/2011 for the course PSC 1121 taught by Professor Khankasayev during the Fall '08 term at Florida A&M.

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Lecture 22_Chapter10 - Home Work: Chapter 10 Lecture 22:...

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