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Amazing science tricks with common household items

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Using common objects around the house, you can demonstrate cool scientific laws. Here’s how:


Keeping Water Separate

keepingwatersep1.jpgFill two identical glasses with water. Add two tablespoons of salt to the water in one glass and stir well. Add a few drops of food coloring to the water in the other glass.

Cover the glass containing the colored water with a sheet of paper, turn it upside down and place it on top of the glass containing salt water. (Be sure to do this trick over a saucer or bowl.)

Gently pull the paper out from between the glasses. The colored water and the salt water will remain separate.

 

keepingwatersep2.jpgHow Does It Work?

Salt water is heavier than colored water, so the two stay separate as long as the boundary between them isn’t disturbed. Try turning the two glasses over, though. The heavier salt water will now be on top, so it will flow down and mix with the colored water.


A Can That Can “Walk”

walkingcanjb2.jpgPlace an empty aluminum can on its side on the floor. Blow up a balloon and tie a knot in the end. Rub a tissue back and forth on the balloon.

When you put the balloon near the can, the can will start rolling toward the balloon.

How Does It Work?

When you rub the balloon with a tissue, the balloon gets a negative electric charge of several thousand volts. When you put the balloon near the can, electrostatic induction affects the molecules in the metal. The outside of the can gets a positive charge, so it is drawn toward the balloon and starts rolling in that direction.


A Candle That Sucks Water

candlethatsuckswater1.jpgPlace a candle upright in the middle of a saucer. Fill the saucer with water. Light the candle. Place a glass over the candle. When the flame goes out, the water in the saucer will get sucked into the glass.

 

candlethatsuckswater2.jpgHow Does It Work?

When the candle is burning inside the glass, the heat makes the air expand, so some of the air escapes outside the glass. The candle goes out after it uses up all the oxygen, so the air inside the glass cools. As it cools, the pressure inside the glass drops. Some of the carbon dioxide formed by the flame dissolves in the water as well, decreasing the pressure even more. The water outside the glass on the saucer is forced into the glass by the higher aire pressure outside.


A Flying Trash Bag

flyingtrashbag1jb2.jpgHold the mouth of a black trash bag in one hand. Use a hair dryer to blow hot air into the bag.

Seal the mouth of the bag with tape. Tie a long piece of string around the tape so you can hold it. Take the bag out into the sun. The bag will rise slowly into the air. (It’s best to do this trick in an open area on a windless day.)

 

flyingtrashbagjb2.jpgHow Does It Work?

Since the bag is black, it absorbs heat from the sun. That heat makes the air inside the bag expand and become lighter. When the bag and the air inside are lighter than the surrounding air, the bag starts to rise.


Bending Light Through Water

bendinglight1jb2.jpgPunch a hole in a clear plastic bottle two inches from the bottom. Put your finger over the hole, fill the bottle with water and cap it to keep it from draining out.

Darken the room and cover part of a flashlight with your fingers to make the beam narrower. When you take the cap off the bottle, the water will flow out in an arc. Shine the flashlight at the stream from the side of the bottle opposite the hole. The light will bend with the arc and create a bright glow where the water hits the sink.

 

bendinglight2jb2.jpgHow Does It Work?

When the light in the stream strikes the boundary between the water and air, much of the light is reflected back into the stream. The light continues this internal reflection all along the arc formed by the falling water. The same principle is used to transmit light signals through flexible optical fibers.


Reading Through an Envelope

readingthruenv1jb2.jpgWith a black felt-tip pen, write a three-letter word in large letters on a white piece of paper. Place the paper in a brown envelope, and insert that envelope into a white envelope. The writing on the paper should now be impossible to read.

Get a piece of dark construction paper or tear out a page from a magazine that is printed on both sides. Roll up the paper into a four-inch-long tube. When you hold the tube against the envelope, you’ll be able to read the writing inside.

 

readingthruenv2jb2.jpgHow Does It Work?

Usually you can’t read the writing inside an envelope because of the light reflected off the envelope’s white surface. But the tube blocks that reflected light, so you see only the light coming through the envelope.


Egg Into Bottle

eggthrubottle1jb2.jpgFind a glass bottle that has a mouth slightly smaller in diameter than an egg. Pour some hot water into the bottle (be careful!), shake it vigorously and empty the water.

Peel a soft-boiled egg and place it on the mouth of the bottle. Leave it there for a while and it will get sucked inside.

 

eggthrubottle2jb2.jpgHow Does It Work?

The vapor from the hot water drives the air out of the bottle. Once the egg seals the top of the bottle, the air can’t get back in. As the water vapor cools, it turns back into water, causing the pressure inside the bottle to drop. The higher pressure of the outside air pushes the egg into the bottle.


Toothpick Torpedo

toothpicktorpedo1jb2.jpgDab a little shampoo on the blunt end of a wooden toothpick.

Drop the toothpick in a pan of water. The toothpick will start moving in the direction of the sharp end.

 

toothpicktorpedo2jb2.jpgHow Does It Work?

Shampoo contains agents that reduce the surface tension of liquids. As the shampoo on the end of the toothpick dissolves, it reduces the water’s surface tension around it, thus releasing the water’s hold on that end of the toothpick. The water around the other end of the toothpick still has surface tension, so it pulls the toothpick in that direction.


To learn more amazing science tricks, check out the book “Amazing Science Tricks” by Michio Goto

27 Comments on Amazing science tricks with common household items

  1. OMG so cool :o :l

  2. chukchukbuchukchuk // September 26, 2010 at 8:30 am // Reply

    do u have other experiments?

  3. Wonderful for little school projects or for example to use in a sunday school lesson, especially the egg getting “sucked in”.

  4. cute!!… like it!!!…. haha…. good enough for my project!!… whew

  5. simple tricks????

  6. kinda cute! i like it…

  7. oh,truly amazing!

  8. sciencetricker // September 1, 2010 at 8:28 am // Reply

    nice one :) :D :) :D :) :D

  9. amazing!very very very amazing

  10. these are preety good

  11. its truly amazing!

  12. nice one!

  13. it is great
    and the best part is that all the things used is present in home easily
    marvellous
    awesome
    i just loved it

  14. awesome

  15. the tricks were nice and my students really loved them. instead of tissue for the can that can walk, they rubbed the balloon on their head and it worked better…. nice tricks….

  16. TROOP 431 // May 4, 2010 at 6:09 pm // Reply

    BILL NYE ISNT DEAD!!!!!!!!!!

  17. Brett Favre blows // April 26, 2010 at 3:10 pm // Reply

    …………… boring but will work for my project.

  18. boring

  19. i liked the tuthpick topedo

  20. i can do better than this,but i appreciate this.

  21. how do we get the egg back out of the bottle :S

    • In order to get the egg back out of the bottle, turn the cool bottle upside down until the egg seals the mouth. With a hair dryer, heat up the glass bottle causing the air to heat up and build up pressure inside the bottle. Continue heating it up until the egg pops out. If the egg breaks when it goes in, it may not have a seal and therefore not be able to build pressure inside it with a hairdryer.

  22. this is the best website ever i love the tricks i hope you add more tricks onto this website thanks alot

  23. icntbperfect // March 2, 2010 at 7:16 am // Reply

    ow!its amazing. also my younger brother was so amazed with this tricks!

  24. wow!!! I LOVE IT

    • madik trickervzz // March 2, 2010 at 3:44 am // Reply

      AMAZING!I’LL USE IT FOR MY PROJECT.I LIKE THE TOOTHPICK SHAMPOO TORPEDO AND ALSO THE CANDLE THAT SUCKS WATER

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