1 / 9

PRESSURE CIRCUS Activity 1. Inverted Cup

PRESSURE CIRCUS Activity 1. Inverted Cup. Summary:. Pressure is in all directions. High pressure outside pushes towards low pressure inside and holds card in place** Air pressure can be stronger than water pressure . Inverted Cup. **Why is it low air pressure inside the cup?

creda
Download Presentation

PRESSURE CIRCUS Activity 1. Inverted Cup

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PRESSURE CIRCUS Activity 1. Inverted Cup Summary:

  2. Pressure is in all directions. • High pressure outside pushes towards low pressure inside and holds card in place** • Air pressure can be stronger than water pressure Inverted Cup **Why is it low air pressure inside the cup? When cup is completely filled with water, no air is left in cup, thus no air pressure. cardboard High Air Pressure

  3. The picture below is a “before and after” shot of a Styrofoam cup that was brought to a depth of 1770 ft. in the waters off the Gulf of Mexico on September 28, 1994. P = 5,500,000 Pa • What do you notice about the cup that was brought underwater? • What might have caused the changes that you notice? • Does this suggest that water pressure behaves in one direction or all directions? • Do you think that water pressure is similar to air pressure? Why or why not?

  4. Title: Activity 2. Collapsing Can Date: Feb. 2010 Explain the principle behind the collapsing can. Summary:

  5. http://www.youtube.com/watch?v=p3b9pK-O6cE&list=UUHnyfMqiRRG1u-2MsSQLbXA&index=22&feature=plcphttp://www.youtube.com/watch?v=p3b9pK-O6cE&list=UUHnyfMqiRRG1u-2MsSQLbXA&index=22&feature=plcp Collapsing Can • Pressure is in all directions. • **High pressure outside pushes towards low pressure inside and caused can to collapse • Air pressure can be strong enough to crush metal **Why is there lower pressure inside the can? -boiling the water steam pushed the air out of the can (LESS AIR PARTICLES). - turn can upside down to block the hole in can air can’t go in or out  Lower pressure inside so higher pressure outside push on the can and crush it.

  6. Collapsing Can Before heating, the can was filled with water and air. By boiling the water, the liquid changed into water vapor  The water vapor or steam pushed the air that was inside, out of the can.  In closing off the can, air is prevented from going back to the can.  Cooling (water in basin) condenses water vapor back to water. All the vapor which took up space inside the can turned into a few drops of water, which take up less space.  Pressure inside can drops allowing outside air pressure to push on the can and crush it. http://www.youtube.com/watch?v=p3b9pK-O6cE&list=UUHnyfMqiRRG1u-2MsSQLbXA&index=22&feature=plcp

  7. Title: Activity 3: Straw drinking race Date: Feb. 2010 Regular straw Modified straw • Who was successful and who wasn’t? • Explain how a straw works for drinking. (When you drink liquid through a straw, is it accurate to say the liquid is sucked up the straw or pushed up the straw?) • Why was the person unsuccessful? Summary:

  8. Straw Drinking Race 1) Sucking creates a partial vacuum or a lower pressure in straw above the liquid that we drink 2) The higher pressure from air surrounding outside pushes the liquid up the straw in our mouth The student with the modified straw cannot create a good vacuum (low pressure/no air) for very long BECAUSE air from higher pressure outside comes in through the holes instead of pushing liquid up the straw

  9. SUMMARY:Cause of Air Movement • Need to think about air pressure in one place compared to it’s surroundings • Ex) Sisters – 1 person alone is not cause, it’s relationship between both of them • Can make comparisons- 1 is older than other • High pressure moves to low pressure • Nature tries to even things out to make pressure the same

More Related