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Unformatted text preview: 1 Lecture 21: Chapter 9 Thermal Energy Home Work: Chapter 9 ! Key Terms ! Review questions: 2, 3, 6, 7, 11, 12 ! Exercises: 1, 2, 7, 8, 10, 19 Energy and its main forms The Universe is made up of matter and energy. Matter is made up of atoms and molecules. The motion of atoms and molecules creates a form of energy which is called thermal energy . ! Good Web Site: http://coolcosmos.ipac.caltech.edu//cosmic_classroom/light_le ssons/thermal/heat.html Light, electrical, mechanical, chemical, nuclear, sound energy can be converted into thermal energy . Energy can take on many forms and can change from one form to another A thermal infrared image of a ball before (left) and after (right) being bounced. 2 How we measure heat or thermal energy? Temperature! Definition of temperature Temperature is a measure of average kinetic energy per molecule. Temperature is a measure of the average kinetic energy of the constituents Cold warm hot Cold hot How we measure the temperature? ! Thermometers are special devices that measure temperature by expansion or contraction of a liquid contraction of a liquid or some materials. ! In common thermometers, a colored alcohol or mercury is used. Units to measure the temperature ! There are different units/scales to measure temperature. ! 1. The Celsius scale uses the scale of 100 degrees between the freezing point of water (0) and boiling point of water (100)....
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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.
- Fall '08