Physics 14: 5-8 Heat Transfer and Phase Change
Text Reading: Giancoli, Physics - Principles with Applications, Chapter 14: 5-8
- 14:5: We pump heat energy into a substance to get it to change temperature. When it reaches a phase change, we continue to pump energy into it, but the temperature doesn't change, because all the energy is going into the phase change. This energy is called latent heat energy. Different materials have different latent heats, just as they have different heat capacities. When we calculate the heat necessary to raise the temperature of a given amount of some substance through a phase change, we have to total the heat added for the temperature change with the heat added for the phase change.
- 14:6: Conduction is the flow of heat energy from one area or substance to another through direct contact. The bottom of a pan sitting directly on a hot stovetop is heated by conduction.
- 14:7: Convection is the flow of heat energy because the hot substance itself moves to a new location. Water near the bottom of our pan on the stove is heated, expands, and moves upward through cooler water, carrying its heat with it.
- 14:8: Radiation is the flow of energy by electromagnetic waves. Unlike conduction and convection, radiation does not require matter for the transmission of energy.
Read the following weblecture before chat: Heat Transfer Mechanisms and Phase Changes
Play with the State of Matter exercise below. What happens during a phase change?
Physics simulation Java Applets are the product of the PHET Interactive Simulations project at the University of Colorado, Boulder.
Chat Preparation Activities
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- Required: Complete the Mastery exercise with a passing score of 85% or better.
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