The study of weather in fourth grade is always exciting because of the many demonstrations and activities that students can participate in to learn about the four variables of weather: temperature, moisture, air pressure and wind. By trying to pour water into a funnel that has been securely fastened to a bottle, students learn that air takes up space. The water does not pour into the bottle because the air has already filled the bottle! Likewise, the ability of air pressure to keep water in a straw will vary, depending on whether your teacher has tampered with the straw to poke holes in it!
These little demonstrations all lead to the piece de resistance: watching air pressure push a hard boiled egg into a milk bottle! Ms. Davis was able to get the egg out in one piece, too. To find out how to do that, you will have to ask a fourth grader!