Fun stuff to do

Amazing Science Tricks

Editor’s Note: Make sure an adult helps you with these experiments.

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

keepingwatersep1.jpgKeeping Water Separate

Fill 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.


How 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.

walkingcanjb2.jpgA Can That Can “Walk”

Place 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.

candlethatsuckswater1.jpgA Candle That Sucks Water

Place 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.

flyingtrashbag1jb2.jpgA Flying Trash Bag

Hold 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

Punch 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.

readingthruenv1jb2.jpgReading Through an Envelope

With 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.

eggthrubottle1jb2.jpgEgg Into Bottle

Find 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

Dab 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

Comments about “Amazing Science Tricks”

  1. khaith29 says:

    Science tricks is amazing! :-P love it.

  2. Rahul says:

    fully educative and interesting..! just awesome..!

  3. BACHOCO says:

    COOL i love science!!!

  4. bhoy says:


  5. barclays says:

    i really like the “Keep Water Separate” experiment!! I’m really impressed! i’m gonna use that experiment for my project, “actual experiment”. I hope my teacher would like it.

  6. Anonymous says:

    the tricks are great that will encourage new invention

  7. sansu says:

    i liked it tooo much!!!!!

  8. san says:

    tooth pick trick is rocker……………

  9. Valeed says:

    all of the above worked and I showed this tricks in my class and all girls became just fan of me :-)

  10. jo says:

    i like it awesome…………….

  11. x heart says:

    toothpick torpedo only works in open water: }

  12. Ed (Edward) says:

    These tricks are sick, ace and mint

  13. cookie says:

    these are so cool, i like love science ! :o

  14. kutta says:

    are there more ways to keep water seperate(with different liquids)? and…how is it usefull?

  15. SUCKERS says:

    well !! it works
    hope you have new tricks

  16. chinnu says:

    these are really great

  17. mine says:

    whoa… amizing tricks it’s working:)

  18. ena says:

    whoa… amizing tricks it’s working:)

  19. Fashion Queen says:

    ♥Looooooooooove it!!!

  20. vin says:

    i love this web, its fun learning and reading

  21. Slahclaw2000 says:

    These tricks are sick!!!

  22. blaze says:

    its cool!!!!!!!

  23. Joanna says:

    not workiiiiing!!

  24. An optimistic pessimist says:

    it seems nice… gonna try it… hope it works… should have more…

  25. ramej says:


  26. marasigan says:

    nc1 i caugh a lot of sci tricks

  27. bugtech says:

    I already tried some of the tricks here and they are great..can you put more new tricks? My students will love it! Thank you

  28. superbat262 says:

    I love it !!!!!!!!!!!!!!!!!!!!!

  29. Tstar says:

    Wow…awesum…learning is fun

  30. Vj Rawat says:

    Cool magic tricks!

  31. 9517867 says:

    keeping water separate is cool and bcoz of that, im the one who will represent it to our science fair

  32. jonius says:

    It’s cool but old..

  33. prettymaye says:

    the “Toothpick Torpedo” doesn’t work.. its fake..
    BTW, the “Egg into Bottle” is awesome.. gonna use it for
    the Sci-tricks..!! XD

  34. BlackMango says:

    Well, for me, the ‘A Candle that Sucks Water’ is GREAT. And that is why I’m gonna use it in my presentation of a Sci-Trick. :) Hope this will work. :) Thanks anyway.

  35. rosthel says:

    I like it

  36. akopretty says:

    Cool but need new tricks.

  37. akopretty says:

    They’re cool but I need new tricks.

  38. dkn says:


  39. sharath says:

    its amazing you are great

  40. abhi says:

    This is fantastic

  41. darksperms says:

    w0w amazing

  42. sweetie says:

    it so very amazingggggg!!!!!!!!!!

  43. Barbie Girl says:

    This is terrific.

  44. elaiza says:

    ilove scince tricks=))

  45. myl says:

    whoa……! :)

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