SUBSCRIBE chat center Chatboards|Lessons|Projects|Classifieds|Mailrings|Gazette|Jobs|Harry Wong|Live!|Advertise NEW LESSONS SEARCH BROWSE SUBMIT! <<PREV MORE LESSONS NEXT>> Share | Print Teachers.Net Lesson Bank Search Teachers.Net Advanced Quick Links: Set #1245. The pressure of invisible air Science, level: Elementary Posted Thu Aug 12 11:02:23 PDT 1999 by Patrick Fureman (patfury@hotmail.com). Dallastown Area School District, Dallastown, PA, USA Materials Required: Bunson burner(heat source),Large metal container(cleaned)with screw top, water, ice, large container Activity Time: 45 min. - 1 hour Concepts Taught: Air takes up space and has pressure 1. Place a small amount of water into the metal container(with th lid off). 2. Boil the water until steam is leaving the metal container. 3. Turn off the heat source. 4. Carefully screw the lid onto the hot metal container tightly. 5. Using OVEN MITTS, remove the metal container and place it into a large container of ice water. 6. The metal container will be crushed by the outside air pressure. EXPLANATION: The boiling of water changes the water from a liguid to a gas. As the gas leaves the container, you shut off the heat source and screw the lid on the container. This prevents air from returning into the metal container and a vaccuum is formed. By placing the container into ice water you speed up the cooling process of condensation, thus turning more of the inside air back into water and increasing the size of the vaccuum that exists. This speeds up the crushing process. THE VACCUUM MUST BE FILLED BY THE METAL CONTAINER!!       June: The 30 Days of Teachers.Net (Introduction) 1 The Gazette 2 The Mailrings 3 Harry Wong 4 Lesson Bank 5 Tech Center 6 Teacher Classifieds 7 State Teachers.Net 8 Live Chat & Meetings 9 Teacher Printables 10 Project Center 11 Chatboard Network 12 Share Teachers.Net 13 Your Feedback 14 Interest Groups 15 Administrators.Net 16 Chat Center 17 Streaming Teacher Video 18 Tutoring Center 19 Academic Grants 20 Teachers.Net Bookshelf 21 Chatboard Tips 22 Grade Levels 23 Staffroom Flyer 24 Teachers.Net Archives 25 Hot Topics 26 Language Arts 27 Subject Areas 28 Quick Links 29 Meet Teachers.Net 30 Summer Job Fair

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