Expansion and Contraction You will be able to
Expansion and Contraction You will be able to • Describe qualitatively thermal expansion and contraction of solids, liquids and gases • Identify and explain some of the everyday applications and consequences of thermal expansion and contraction
Gather round!
Expansion • Many substances expand when heated • When heated, the particles (atoms or molecules) in a substance vibrate more • This means they need more space • So the substance expands Heat
Important note! The particles in a substance do not expand themselves! Heat Particles are the same size
Contraction • The opposite happens when most substances are cooled • The particles vibrate less • They need less room • The substance contracts Cools
Solids • The expansion of solids is small but strong! Like me!
Expansion in solids This means that we sometimes have to take into account expansion
Expansion in solids This means that we sometimes have to take into account expansion
Contraction can also be a problem
Liquids • Most liquids expand when heated
Gases • Gases expand a lot when heated! • http: //www. youtube. com/watc h? v=A 843 PL 6 Yejs&feature=re lated • http: //www. youtube. com/watc h? v=Zg. TTUu. JZAFs&feature= related
Temperature and volume of a gas at constant pressure http: //phet. colorado. edu/en/simulation/gasproperties
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