Explore Solids and Liquids! by Reilly Kathleen M.;Stone Bryan;

Author:Reilly, Kathleen M.;Stone, Bryan;
Language: eng
Format: epub
Publisher: Nomad Press
Published: 2014-08-15T00:00:00+00:00

2 Place the coated cardboard or card on top of the glass. Be sure it completely covers the opening of the glass and extends out over each side. You don’t want to be able to see into the glass at all.

3 Hold the cardboard tightly against the glass with one hand. Stand over the sink (or outdoors) and quickly turn the glass upside down. Be sure to keep holding the cardboard tightly over the opening!

4 When the glass is completely upside down (and you’re still over the sink or outdoors, just in case!), remove your hand from the cardboard. What happens? Can you explain why?

WHAT’S HAPPENING? Air pressure is what makes this trick work. Because you filled the glass only halfway, the rest of the space in the glass is filled with air. And of course there’s air all around you. Air is always pushing down, up, around—everywhere. That’s why we have changes in weather, because giant air masses are always moving around the planet. The large amount of air outside the glass pushes harder against the cardboard than the small amount of air inside the glass pushes down on the cardboard.

BRRRR! CHILLY BALLOONS

SUPPLIES

2 same-sized balloons filled with the same amount of helium

camera or something to draw with

2 long pieces of string

freezer

outdoor area or tall stairwell

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