By William C. Robertson
Through William C. Robertson, Ph.D. Make earth technology instructing a normally sunny event with this best-selling task advisor! simple homes of air and water are basically and appropriately defined and are observed via drawings and hands-on actions utilizing available fabrics. those options then develop into the root for illustrating climate styles together with the jet movement, hurricane fronts, tornadoes, and hurricanes. 134 pages. Paperback. Grades 3-8.
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Extra info for Air, Water, & Weather: Stop Faking It! Finally Understanding Science So You Can Teach It
This rule is especially important if you do this activity with adolescents and teens! l Once the participants understand the rules, go through the following steps and ask the group and yourself the following questions. 1. Have the people start by pretending to be cool gas molecules, moving about slowly. After a bit, ask how much of the available space the molecules use. Another way of stating this is, if the people had wet paint on their shoes, would they eventually paint Stop Faking It: Air, Water, & Weather 21 2 2C h a p t e r the entire area?
Org significantly reduced8 (remember that reducing the numCode: SFAWW05 ber of molecules reduces the air pressure). So, because of the initial heating of the air around the candle and because of the burning process, you have fewer gas molecules inside the glass than you would have otherwise. Once the candle goes out (not enough oxygen for it to keep burning), your source of heat is gone and the gas molecules inside the glass move slower. At this point, the outside air pressure, which is our normal atmospheric pressure, is much greater than the air pressure inside the glass.
Over a sink (just in case the trick doesn’t work), quickly turn the whole contraption upside down, holding on to the index card as you do. Then release the card. If everything does what it’s supposed to, the card will stay where it is. Impressive. The explanation for this includes a concept known as surface tension, but given that I’m not going to address that concept until later in the book, we’ll just focus on what’s happening with the air pressure, or lack thereof. Ordinarily, you would expect the weight of the water to push down on the index card hard enough that the card falls off and the water follows.
Air, Water, & Weather: Stop Faking It! Finally Understanding Science So You Can Teach It by William C. Robertson