There are some simple experiments that really impress kids or even adults. They may not fully understand why it is possible to do so, but will remember the common scientific knowledge behind it when explained.
Here are the 9 most exciting experiments enough to shock your audience. Everything you need for a performance can be found at your home. Take this practice and use this to teach your child about the hard-to-understand scientific knowledge.
1- Pencil skewers water bag
You need: A plastic bag made of polyethylene, some common pencil and water.
Experiment: Pour water into half a bag of plastic. Slide the pencils past the submerged bag.
Explanation: If you slid the bag with a pencil and then pour in water, the water will permeate through the oblique holes and leak out. But if you pour water in front and then skewer the pencil, water will not leak out. This is the result of the principle that when polyethylene is broken, the molecules move closer together. In this case, the polyethylene was tied to the pencil body.
2- The ball is not broken
You need: 2 rubber balls and a few pins
Experiment: If you have a rubber ball inflated and put it on top of a pin, it will definitely explode. However, if you take a few pin up on a flat and then take the ball on the “face” with a pin, this time you can also hit the ball on the pin that it will not break. You can even add a touch of glamor to your performance by placing a brick over the ball (but do not put too much weight on it).
If you try this experiment, be careful, you may want to wear eyeglasses to protect your case from over-inflating hands and balls.
Explanation: When you increase the number of pins under the ball, the pressure on each pin decreases and therefore the ball does not explode.
3- Colorful cabbage
You need: 4 cups with water mixed with food color and a few cabbage leaves.
Experiment: Put a glass of cabbage leaves in each glass. To do so overnight. Next morning you will have colorful leaves.
Explanation: Because the leaves absorb water, they also absorb the color that is in the water. This is called the capillary effect, through which water goes into the smallest tubes of the leaf. This happens with flowers, grasses and even trunks.
4- Balloons do not burn
You need: 2 balls, candles, matches and water.
Test: Blow a ball up and fire it on the burning candle to prove that the fire will break the ball right away. Then pump the water into the second ball and place it over the burning candle again. You will find that in this case the ball can withstand the heat of the flame.
Explanation: The water in the ball absorbs heat from the candles, so the shell of the ball does not burn and burst.
5- Floating eggs
You need: 2 eggs, 2 glasses of water and some salt.
Trial: Carefully place an egg in a clean, normal glass of water, which will fall to the bottom of the cup. Then pour some hot water into the second glass and add 4-5 teaspoons of salt. The experiment will be more successful if you wait until the water cools. Then drop the second egg into it. It will float on the surface instead of sinking to the bottom.
Explanation: The secret here is the molecular weight of eggshell and water. The average molecular density of eggshells is much larger than pure water, so it sinks to the bottom of the cup. The molecular density of the salt mixture is higher than the eggshell, so that the egg can not fall to the bottom of the salt that floats on the surface.
6- Burn the matches with elastic bands
You need: Two matchsticks and a rubber band
Test: Tie the rubber cord around the two matches as shown. Hold a match and tie the remaining match to the elastic straps. Keep the match stick upright, when you release the elastic cord, the remaining match will burn.
Explanation: The matchstick burns when it is rubbed with the phosphor coating covered with the elastic band.
7- Own your own avocado tree
You need: An avocado, 4 toothpicks and a glass of water
Experiment: Clean the bean sprouts, put 4 sticks of beads around the bean sprouts, and keep it balanced on a glass of water so that the pointed portion of the bean sprouts upwards. The lower part of the seed must be submerged in water. Let the peanut leave for a few weeks at room temperature and continuously fill with water to fill the bottom of the bean butter when the water is gone. Soon the butter will take root and crack the head and grow a new tree. Once it has germinated, you can place the seed in a more comfortable bowl to start growing.
Explanation: The toothpicks keep the seeds from touching the bottom of the cup so that the roots can grow normally. And all the rest is due to the power of nature!
8- Ice Candy
You need: 2 glasses of water, 5 cups of sugar, a few small wooden sticks, some sheets of paper not too thin, a few vials, a pan and food coloring.
Experiment: Sprinkle sugar on paper, dip it in water and roll it on paper so that the pieces of sugar stick to the rod. Allow the sticks to dry overnight.
The next morning, make 2 glasses of water with 5 cups of sugar, boil and let cool for 15 minutes. Then pour syrup into the empty jars and add food color to the beautiful. Put the dried wooden sticks into the jars and do not let them touch the bottom or bottle – you can use the clamps to keep them straight.
Now wait and see what happens. The sugar will precipitate sticking to the stick, forming glittering stones and still eat.
Interpretation: The solubility of syrup water decreases as the temperature decreases, creating a precipitation of sugar on the stick.
9- Fire-fighting matches without shadows
You need: A match
Experiment: Light the match so it is about 10-15 cm from the wall. You will notice that only the shadow of your hand and the stick of matches are on the wall without the flames.
Explanation: Fire does not create shadows on walls because it does not interfere with light passing through it.