- I took a bag (we tried gallon and sandwich size plastic bags and paper lunch sacks) and turned on the hair dryer. While the hair dryer was blowing the bag would go up, but as soon as I turned it off the bag would fly in a loop and come down, so I’m not sure if it was the heat or the blowing air that made the bag go up.
- We read Air is All Around You by Branley
- We cut out pictures of the sky and glued them on the top half of the number 2. That completed our unit on Air.
Wednesday we started our unit on Water. These experiments are from 365 More Simple Science Experiments by Churchill, Loeschnig, and Mandell.
Wednesday we learned that marbles and water can’t occupy the same space.
- I took a clear glass and filled it about half full.
- Then I took a piece of Scotch tape and put it on the glass (make a tab at one end so it will come off easily).
- I had K. use a pencil and draw a line on the tape at the level of the water.
- Next we added about 7 marbles and noted that the water level had risen.
- Why? The marbles and water can’t occupy the same space. The marbles, being heavier than the water sink to the bottom and push the water out of their way, causing the water level to be pushed above the mark on the tape.
- K. wanted to put all the marbles in the water, so I let her.
Thursday we learned about the power of water.
- Turn a faucet on just a little bit. Try to stop the water coming out with your hand. Why can’t you stop it?
- Take a tin can and, using a nail and hammer, make 3 holes. The first should be near the bottom, the second about ½-inch higher, and the third ½-inch higher. The instructions said to make the holes in a straight line, but the water streams merged together, so I would suggest having them offset a little bit.
- Cover the holes with tape and fill the can with water.
- Place the can on the edge of the sink and remove the tape. Which stream of water is longest?
- Why? The water at the bottom of the can is under more pressure than the water above it, so it has the longest stream.
- Why can’t you stop the water from the faucet with your hand? Because all the water pressure behind it.
Friday we learned about disappearing salt.
- You’ll need: a clear glass 3/4ths full of warm tap water, tape, pencil, ½ cup of salt, spoon for stirring
- Mark the level of the water on the tape (as in Wednesday’s experiment).
- Very slowly add the salt, while stirring the water.
- When you are done, check the level of the water. Did it change? If it did change, was it by ½ a cup or very little?
- Why? The molecules of water have space between them. These spaces are filled by the molecules of salt. This is called a solution.
- Compare this to Wednesday’s experiment when the water level rose.
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