Read Online Everything Kids' Magical Science Experiments Book by Tim Robinson - Free Book Online Page B
Authors: Tim Robinson
Tags: epub, ebook
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sticking out the top of the bottle.
Blow into the mouth of the balloon and try to inflate it. You should find it very difficult to do.
Now place the straw next to the balloon inside the bottle. Be sure that the end of the straw sticks out of the mouth of the bottle.
Try inflating the balloon again. You should find it much easier to do so.
Part II
As before, place the balloon inside the bottle with its mouth sticking out the top of the bottle.
Blow into the mouth of the balloon and try to inflate it. You should find it very difficult to do.
Using the thumbtack, poke a small hole, about the size of a nail hole, in the bottom of the bottle.
Now when you try to inflate the balloon by blowing into its mouth, it should inflate easily.
Questions for the Scientist
Why did the balloon not inflate initially in either of the tests?
Where did the air you blew into the balloons go in both tests?
The straw and the hole you made in the bottle allowed air to escape from the bottle. Where did this air come from?
If you are blowing air into the balloon and air is escaping through the straw or hole, how does the balloon inflate?
I Can't See You
Start at the letter marked with a dot. Collect every other letter around the circle, clockwise, until you have them all. You will need to go around twice! Read the letters in order to find out what this scientist has discovered.
We didn't tell you which way to go around the circle âyou will have to discover that by yourself!
Try This: Balloon Cents
Don't you hate it when you have a balloon all blown up and it unexpectedly springs a leak? All your work is wasted, and try as you might, it's nearly impossible to reinflate a balloon once it's been deflated. But this time you will actually be able to repair a hole in a balloon, hopefully before all the air leaks out. Granted, the fix won't last forever, but it will do the trick for a while at least.
Question: Can you repair a leak in a balloon?
Materials
Medium latex balloon
Penny
Vegetable oil
Small needle or pin
Procedure
Place the penny inside the balloon before inflating it.
Inflate the balloon so that it is more than halfway, but not all the way, inflated. Tie off the end.
Practice swinging the balloon around so that the penny inside spins around the inside of the balloon. You can best do this by holding the balloon near the knot and letting it hang down.
Dip the needle in oil and carefully insert it into the end of the balloon opposite the knot. Remove the needle, leaving a small hole.
While holding the balloon as before, allow the penny to align itself over the hole in the end of the balloon.
Slowly turn the balloon right side up and the penny should stay in place, effectively sealing the hole.
The Science Behind the Magic
Try as you might to seal a hole in a balloon from the outside, it will most likely fail. Some people try to use a piece of tape, or glue, or other adhesive. But the air inside typically pushes against the seal and the hole stays unpatched. But the penny seals the hole from within because of the difference in air pressure inside the balloon compared to outside the balloon. When you blew up the balloon, you filled it with air that is compressed inside. This produces more air pressure inside than outside. As a result, when the penny is allowed to cover the hole, the higher air pressure inside the balloon pushes outward on the penny, keeping it in place over the hole and preventing any more air from leaking out.
Follow-Up
There are a number of variations of this experiment that you can try. For example, you can try other coins to see which are most effective at sealing holes. You can also try dipping the coins in different liquids, such as oil or water, to see if the addition of those liquids forms a tighter seal than the coin alone. Another option is to try poking the hole in different places on the balloon. Is there a reason why you were instructed to make the hole at the end opposite the knot? Finally, you can time the
Blow into the mouth of the balloon and try to inflate it. You should find it very difficult to do.
Now place the straw next to the balloon inside the bottle. Be sure that the end of the straw sticks out of the mouth of the bottle.
Try inflating the balloon again. You should find it much easier to do so.
Part II
As before, place the balloon inside the bottle with its mouth sticking out the top of the bottle.
Blow into the mouth of the balloon and try to inflate it. You should find it very difficult to do.
Using the thumbtack, poke a small hole, about the size of a nail hole, in the bottom of the bottle.
Now when you try to inflate the balloon by blowing into its mouth, it should inflate easily.
Questions for the Scientist
Why did the balloon not inflate initially in either of the tests?
Where did the air you blew into the balloons go in both tests?
The straw and the hole you made in the bottle allowed air to escape from the bottle. Where did this air come from?
If you are blowing air into the balloon and air is escaping through the straw or hole, how does the balloon inflate?
I Can't See You
Start at the letter marked with a dot. Collect every other letter around the circle, clockwise, until you have them all. You will need to go around twice! Read the letters in order to find out what this scientist has discovered.
We didn't tell you which way to go around the circle âyou will have to discover that by yourself!
Try This: Balloon Cents
Don't you hate it when you have a balloon all blown up and it unexpectedly springs a leak? All your work is wasted, and try as you might, it's nearly impossible to reinflate a balloon once it's been deflated. But this time you will actually be able to repair a hole in a balloon, hopefully before all the air leaks out. Granted, the fix won't last forever, but it will do the trick for a while at least.
Question: Can you repair a leak in a balloon?
Materials
Medium latex balloon
Penny
Vegetable oil
Small needle or pin
Procedure
Place the penny inside the balloon before inflating it.
Inflate the balloon so that it is more than halfway, but not all the way, inflated. Tie off the end.
Practice swinging the balloon around so that the penny inside spins around the inside of the balloon. You can best do this by holding the balloon near the knot and letting it hang down.
Dip the needle in oil and carefully insert it into the end of the balloon opposite the knot. Remove the needle, leaving a small hole.
While holding the balloon as before, allow the penny to align itself over the hole in the end of the balloon.
Slowly turn the balloon right side up and the penny should stay in place, effectively sealing the hole.
The Science Behind the Magic
Try as you might to seal a hole in a balloon from the outside, it will most likely fail. Some people try to use a piece of tape, or glue, or other adhesive. But the air inside typically pushes against the seal and the hole stays unpatched. But the penny seals the hole from within because of the difference in air pressure inside the balloon compared to outside the balloon. When you blew up the balloon, you filled it with air that is compressed inside. This produces more air pressure inside than outside. As a result, when the penny is allowed to cover the hole, the higher air pressure inside the balloon pushes outward on the penny, keeping it in place over the hole and preventing any more air from leaking out.
Follow-Up
There are a number of variations of this experiment that you can try. For example, you can try other coins to see which are most effective at sealing holes. You can also try dipping the coins in different liquids, such as oil or water, to see if the addition of those liquids forms a tighter seal than the coin alone. Another option is to try poking the hole in different places on the balloon. Is there a reason why you were instructed to make the hole at the end opposite the knot? Finally, you can time the
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