Skill Builder

This house is of 1200  square feet. The collector have to occupy a third of the house.

collector
living space   

300ft2       1
1200ft2     4 

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Essay

How Does A Solid Become Liquid The higher temperature in an object, the faster the molecules move. When the temperature of ice reaches    0° C,  t he molecules break free. The movement its very large that that the attractive forces of each other molecules cant hold them in place then the crystal structure collapse and the ice become water. When a substance change from solid to liquid is called melting point . Freezing When ice is melt and become water it can be reversed by cooling the liquid. When water melt the particles slow down and come closer together. This process is called freezinng point . The temperatureis constant while the crystal structure forms and heat is released. Viscosity is a materials resistance to flow, glass has no freezing point because when the temperature of the liquid decreases it becomes more viscous, it becomes thicker and resistant to flow.
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Section Assessment

Thinking Critically 16. Much discussion has focused on the need to drive more efficient cars and use less electricity. If the law of conservation of  energy is true, why are people concerned about energy usage ? people is using energy for things that are not important . 17. if heat flows in only one direction, how can both hot and cold liquids reach room temperature as they sit on a table?   hot looses heat and goes to the air and the air goes to the cold . 18. think about what happens to jack and jill in the nursery room. what kinds of enrgy are used? how was each energy form used? both, kinetic and potential energy because if they are moving they are using kinetic energy and if they dont is potential energy. 19. compare the 3 temperature scales you learned about. how are they different? how are they similar? in the celsius scale water freezes at    0° and boils at   100 ° farenheit scale water freezes at   32 ° and boils...
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