Behavior of Liquids and Gases: Diffusion and Pressure<br />7SCIENCE Mon. April 11<br />
Review: How do substances change state?<br />How does a liquid change to a solid?<br />Freezing (freezing point temperatur...
How do liquids and gases behave?<br />Diffusion<br />Pascal’s principle<br />Archimedes’ principle<br />
Diffusion <br />Diffusion is the mixing of particles<br />Movement of particles from an area of high concentration to an a...
Pressure and Pascal’s principle<br />Pressure is force applied over a certain area<br />Pressure = force<br />		       are...
Gas Pressure andPascal’s principle<br />You may increase the pressure of a gas in a confined space by forcing more particl...
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Behaviour of liquids and gases

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Behaviour of liquids and gases

  1. 1. Behavior of Liquids and Gases: Diffusion and Pressure<br />7SCIENCE Mon. April 11<br />
  2. 2. Review: How do substances change state?<br />How does a liquid change to a solid?<br />Freezing (freezing point temperature)<br />How does a solid change to a liquid?<br />Melting (melting point temperature)<br />How does a liquid change to a gas? (2)<br />Boiling (boiling point temperature)<br />Evaporation<br />How does a gas change to a liquid?<br />Condensation<br />What is the name for the process in which a solid changes to a gas or gases change to a solid?<br />Sublimation <br />
  3. 3. How do liquids and gases behave?<br />Diffusion<br />Pascal’s principle<br />Archimedes’ principle<br />
  4. 4. Diffusion <br />Diffusion is the mixing of particles<br />Movement of particles from an area of high concentration to an area of low concentration<br />Why can we smell a fire even though we are far away?<br />Particles in the gas state are far apart and move freely to mix with the air <br />Many toxic gases are mixed with chemicals so you can smell them and move to safety!<br />
  5. 5. Pressure and Pascal’s principle<br />Pressure is force applied over a certain area<br />Pressure = force<br /> area<br /><ul><li>Unit of pressure is called a pascal (Pa)</li></ul>Pascal’s principle states that:<br />If you apply pressure at any point in a confined substance, the pressure travels unchanged throughout the substance<br />Example: if you squeeze toothpaste thatforce will move through the toothpaste and push it out of the hole in the tube<br />
  6. 6. Gas Pressure andPascal’s principle<br />You may increase the pressure of a gas in a confined space by forcing more particles into the same amount of space<br />Ex: inflating a balloon or a ball<br />Increasing the pressure by adding more air particles to the space<br />What do you think would happen to the pressure inside the ball if you inflated it inside a warm building then took it outside to a cold temperature?<br />

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