VOCABULARY particle theory of matter heat kinetic energy temperature thermal energy thermal expansion thermal contraction 7 CHAPTER 8 Chapter 7 • Heating and Cooling NEL Heating and Cooling KEY QUESTION: How does heat affect matter? Looking Ahead Heating and cooling are important in everyday natural and artificial processes. The particle theory explains heating and cooling. Heat is the transfer of energy from warmer substances to cooler substances. Most materials expand when they are heated and contract when they are cooled. Investigation skills can be used to learn about expansion and contraction of different materials.
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VOCABULARY
particle theory of matter
heat
kinetic energy
temperature
thermal energy
thermal expansion
thermal contraction
7CHAPTER
8 Chapter 7 • Heating and Cooling NEL
Heating andCooling
KEY QUESTION: How does heat affect matter?
Looking Ahead
Heating and cooling are important in everyday natural and artifi cial processes.
The particle theory explains heating and cooling.
Heat is the transfer of energy from warmer substances to cooler substances.
Most materials expand when they are heated and contract when they are cooled.
Investigation skills can be used to learn about expansion and contraction of different materials.
Sci7_UnitC_Chap7.indd 8Sci7_UnitC_Chap7.indd 8 7/23/08 1:42:33 PM7/23/08 1:42:33 PM
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