WEBELOS
Scientist
Take the second plastic cup and place
it upside down on the first cup. Make
sure the rims meet evenly and the cups are sealed.
Observe what is happening in the
cups. Turn the lights out and use a
flashlight to observe your cloud. You
may also get a better view using a magnifying glass.
A cloud contains billions of tiny
water or ice droplets that form around dust or salt.
Clouds form when water vapor (a gas) changes into liquid and warm or cold
air meet. In this activity, the
warm moisture-saturated air in the bottom of
the cup moved upward and met the cooler air at the top of the cup.
Static
Electricity
Greater St. Louis Area Council
This activity will create static
charges from a variety of materials.
Materials:
Rice Krispies, 2 balloons, paper plate wool cloth, pepper, salt.
Inflate one balloon, knot it, rub it
on your heard or with a wool cloth, and try to stick it on a wall.
Observe what happens.
On your paper plate make a combined
pile of salt and pepper. Then, rub
the already inflated balloon with the wool cloth and place it just above the
salt and pepper. Observe what
happens.
Put 6-12 Rice Krispies inside the
second balloon, inflate it, and knot it. Then
rub it with the wool cloth, touch one of your fingers to the balloon where the
Rice Krispies are, and observe what happens.
Rubbing the balloon on your head or
with a wool cloth creates a negative charge.
The wall which has a positive charge attracts the negatively charged
balloon, allowing the balloon to stick to the wall.
The same thing occurs with the balloon and the pepper. The Rice Krispies jump inside the balloon because the balloon
has been given a negative charge from the wool cloth. As your finger approaches the balloon it picks up a positive
charge through magnetic induction just like the Rice Krispie and the two like
charges repel each other.
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