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THERMAL EXPANSION

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makayla runion

on 6 October 2016

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Transcript of THERMAL EXPANSION

Why do materials expand or contract when heated or cooled?
Noel,Sid And Makayla Inc.

Thermal Expansion
October 4, 2016
Many objects expand and contract when heated and cooled . Some examples of these things are most metals , concrete, balloons, and rubbers. Those are some of the many materials that expand when they're heated and contract when they're cooled.
Some materials that expand and contract when heated and cooled!
How does technology have to adjust for thermal expansion?
By: Makayla, Sid, and Noel
When materials are heated they often expand. Expansion takes place because when materials are heated they gain more kinetic energy (endothermic) which causes the molecules in the material to move around more freely. As a result of the molecules moving around more freely they space out and take up more space which causes the material to get bigger and expand. Likewise when materials are cooled they contract . The reasoning for this is because when materials are cooled kinetic energy is lost (exothermic) which causes the molecules to come together and not be as spaced out which then causes the material to contract and become smaller.
What are some examples of materials that expand when they get hotter and contract when cooled?
metal
balloons
concrete
plastic
rubber
If the object is made up of a material that experiences a lot of heat, then it needs to adjust for thermal expansion, even if the object is not measuring in it. For example when we look at bridges and buildings they have to adjust for thermal expansion since they are often composed of materials that experience a lot of heat and expand more.
Why does water expand when it becomes a solid?

Water molecules are oddly shaped. They look like the head of Mickey Mouse, because of their odd shape when the molecules link together large holes are left which leaves quite a bit of "empty" space. When linked together the molecules lock in place in a crystalline structure . This structure takes up more space than when the molecules are free. Since more strong bonds can be made when water freezes it releases energy, of which takes up more space. This is why water expands when it becomes a solid.
Why is that important for life on Earth?
Ice expansion is important to some marine animals. For example they use the ice to get out of the water and rest on. If the ice was not less dense and didn't float many sea animals would have to adapt differently to this. This is also important because if ice was less dense than water it would keep sinking and layering up below the ocean. With that fish and other water animals would not be able to live in the ocean. Currently since ice is more dense than water it floats so fish and other underwater animals can live under the ocean. Many forms of life are adapted around ice being less dense than water.
Citations
http://kingofwallpapers.com/ice.html
http://www.cawater-info.net/all_about_water/en/?p=1776
http://worldoceanreview.com/en/wor-1/climate-system/great-ocean-currents/water-a-unique-molecule/
http://www.balsabridge.com/images/clipart/clips.htm
https://clipartix.com/bridge-clipart-image-24862/
http://lemerg.com/694601.html
http://lemerg.com/659737.html
https://www.mansfieldct.org/Schools/MMS/staff/hand/atomsheat.htm
http://slideplayer.com/slide/4893330/
http://www.clipartpanda.com/categories/metal-clip-art-images
http://www.canstockphoto.com/vector-clipart/pouring-concrete.html
http://www.clipartkid.com/water-bottle-cliparts/
http://clip4art.com/50rubber-tire-clipart-hight-resulation.png/tire-images-clipartsco-royalty-free-rubber-tire-clipart-50rubber-tire-clipart-hight-resulation
http://www.clker.com/clipart-balloon-9.html
metal~
balloon~
water bottle~
tire~
concrete~
expansion and contraction comparison~
http://www.schoolphysics.co.uk/age14-16/Heat%20energy/Expansion/text/Freezing_water_and_regelation/index.html
fish~
expansion and contraction molecules~
http://geologycafe.com/gems/chapter1.html
Crystalline and Non-Crystalline~
ice~
water molecule~
water molecules link together for ice~
bridges~
buildings~
Full transcript