Magic in science......?????

Question

I need to make a working/practical project on the topic 'Magic in science' What shall I make ? Plz don't suggest me any simple working model in dry cells, batteries etc. Plz suggest me something

which is unusual and magical.

Plz answer....Thanks.....

Answer 1

My fav magic trick is what I call invisible water.

Put some ice and 150ml Vinegar in a tall glass.

Add Baking soda and let bubble for a minute.

Light a candle and pour the "invisble water" onto the flame.

The CO2 produced in the glass is cold and therefor heavier than air.  It pours like water.

The flame, which needs O2, is doused out because it lacks oxygen.

You can also note the properties of CO2 that it is colorless/odorless.  Be sure to point out that it is the temperature difference that makes the gas sink, NOT because it's a heavier molecule.

It really is a fascinating demonstration; especially if you line up >5 candles and pour the co2 across the group.  They snuff out just like being doused with water.

...

Another very cool demstration has to do with emulsions and surface tension. I'd never really thought about making it a magic trick but I suppose you could call it the magic finger.

Pour a layer of 2% milk on a plate only 1/2 cm thick. Place drops of food coloring around the surface. The drops will stay put. The emulsion of fat/water that composes the milk does not allow the waterdrops to disperse.

Have a volunteer touch the surface of the milk near a drop and instruct not to stir it around. Nothing happens.

Then discreetly rub a bar of soap in your pocket. Touch the surface with a soapy finger and the colors will explode all over the milk making cool swirls.

The soap breaks the tension between the colored water and the milk emulsion. You can go from there to explain the composition of milk, emulsion and surface tension.

Answer 2

I was going to also suggest a method very similar to the above.

If you're really short on time and equipment, a good one to do it to take a fairly large bowl, and place a coin in the centre of it. Ask people to stand around the bowl in such a position that the outer edge of the bowl just appears to be touching the outer edge of the coin.

Next, take some water and pour into the bowl. The coin will look as though it has disapeared. This si simply because the refractive index of water is less than that of air.

Hope this helps.