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Air Pressure Lab

This guide explores key concepts of air pressure through engaging experiments. Discover how flowing air decreases pressure with a wind sock demonstration, and learn about the relationship between volume and pressure using a baggie of air. We illustrate how pressure affects density with a stack of pennies, and examine flow dynamics using a can experiment. Witness the effects of air pressure with a leaky bottle and an upside-down cup, and observe the crushing effect in a hot can experiment, where water vapor turns into liquid.

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Air Pressure Lab

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  1. Air Pressure Lab Explanations…

  2. Wind Sock… • Flowing air decreases air pressure. • Air flows into area of low pressure to “fill in” space. • Blowing up like balloon was harder because you did not have help from air pressure!

  3. Baggie of Air • Increased V = Decreased P • Decreased V = Increased P

  4. Stack of Pennies • As pressure increases… • So does density. • Mass. • Pennies on bottom of stack have greater pressure than top.

  5. The Wind Between the Cans… • As air was forced in between the cans… • A low pressure area was created. • What filled the area?

  6. Leaky Bottle • When cap is off… When cap is on… Air pressure is pushing water out of bottle.

  7. Upside Down Cup • When cup was flipped over, index card stayed pressed to cup. • As you inverted the cup. Water drips out of the cup. More air pressure outside than inside!

  8. Hot Crushed Can • As can and water were heated. • Water went from liquid form into water vapor or a gaseous form replacing air in can. Air Water Vapor

  9. The Crush • When can is flipped over and placed in cool water the water vapor is cooled back to liquid phase. • A gap is created of very low air pressure. • Outside air pressure is much higher. Crushes can.

  10. Questions?

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