HOW TO PROVE WATER VAPOUR IS PRESENT IN AIR???

Do you know water vapour is present in the air?? Water vapour is a gaseous form of water. Let's prove that water vapour is present in air?
Materials:
Clean glass tumbler
Dry towel
Ice cube

Instructions

Wipe the outside of the glass with a clean dry towel to ensure it is dry from the outside.


Place a few ice cubes inside the glass and wait for a few minutes.


Observe: You would notice the outside of the glass turns misty and finally droplets of water appear on the outside of the glass


HOW DOES THE WATER COMES OUTSIDE THE GLASS???


This happens because of condensation. Water vapor is present in air and when comes contact with cold objects changes into liquid form

FAKE BOILING WATER WITH FRICTION!!!

Can you make water boil with friction? Sounds tough but is easy! (you would need a friend for this experiment)


Materials:
A small jar around 5cm wide
Water
Two 15cm square cheesecloth pieces 
A wide rubber band 
Cover the top of the cloth with two pieces of cheesecloth and use the rubber band to keep the cheesecloth in place.


Pour the water into the glass through the cheesecloth and make sure to wet the cheese cheesecloth thoroughly.


Then quickly turn the glass upside down. Don't worry the water won't fall down unless you did not make the cloth thoroughly wet while putting water into the glass through the cheesecloth.


Now ask your friend to rub his hand on the piece of fabric until his finger becomes hot by friction.


Continue to hold the glass upside down and ask your to put his/her finger which he/she had warmed on the cheesecloth.


Observe: Bubbles rise up from the spot where your friend had touched!!

How did the bubbles come?!?!

The bubbles you saw were air bubbles that had been trapped between the fibers of the cheesecloth. When your friend touched the cloth the air was forced up into the water because of the heat!

How did the water stay in the glass when you turned the glass upside down?!?!

When you poured water through the cheesecloth into the glass the tiny openings in the cloth were filled with water, Water molecules formed in the cheesecloth were strongly attracted to each other.

They formed an invisible skin known as water tension in each small space space that has air. The water tension was strong enough to hold the water inside the jar!!!!

STATIC MAGIC!!!

Let's have some fun with static electricity!!


Materials:
2 books of equal thickness
Tissue paper
Scissors
A small piece of glass
A woolen towel or a scarf

Instructions

Position the books opposite to each other. Now fit in the glass piece between the pages and make sure that the glass is leveled. The glass should look like a bridge connecting the two books.

Now cut the paper into small bits.

Put the paper bits under the glass. now rub the woolen towel or scarf on the glass.

Observe: The bits of paper bounce up and down because of static electricity you made when you rubbed the glass with a woolen towel or scarf.

HOW TO TEST COLOURS???

Do you know - Colours are made up of many colours? Do you want to see colours present in colours like- Black, blue etc? Then follow the experiment given below!!


Materials:
A blotting paper
A pencil
Water-based, dark coloured felt tip pens, like:- black, blue etc
A toothpick
Water
Paper
A wide mouth drinking glass or bowl
Scissors
Tape

Instructions

Cut the blotting paper in strips. 2.5cm wide and 12.5cm long. One strip to test one colour.

Fill the bowl with water.

With the felt tip pens make a 1.3cm dot on the strips bottom.

Put the end of the strip with the dot in the water and hold the strip with the other end. Remove the strip from the water when the water has reached the end you are holding. Tape the tested strip on a sheet of paper and allow it to dry.

When the strip dries observe the different colours. Those are the colours that made up the colour you had tested!!! 

TO PROVE OXYGEN IS REQUIRED FOR BURNING!!!

You know air is needed for burning, but do you also know oxygen present in air is needed for burning? Let's prove it!!!


Materials:
A pan of water 


Empty milk bottle


Candle


A box of matches

Instructions

Fix the candle on the pan of water now light the candle.

Then invert the milk bottle on the candle.

Observe: The candle extinguishes and the water rises 1/4 of the milk bottle.

How Does The Water Rises?!?!

As the oxygen in the glass is used by the candle the water takes the oxygen's place, but you may not be clearly answerable to the question "Is oxygen used for burning?" Let me tell the answer. As there is only 22% (1/4) of oxygen of the air the water rises 1/4 proving the absence of oxygen! 

HOW TO MAKE AN ELECTROMAGNET???

Do you now what is an electromagnet? It is a magnet that works with electricity! So, let's try to make one!!


Materials:
A large iron nail


2  3feet of copper wire


A fresh D size battery


A few paper clips


Tape

Instructions

Leave about 8inches of wire loose at one end and wrap most 

of the rest of the wire around the nail. Try not to overlap the 

wires. Do the same with the other wire.

Connect one wire to one end and the other wire to the other

end. Now tape them to the battery.

Your electromagnet is ready! bring the tip of the nail towards

the paper clip and watch as the paper clip moves towards the 

nail!!

CUTTING GLASS LIKE CARDBOARD

Can you cut glass like cardboard? Let's try!!


Materials:
A piece of glass


A large bowl filled with water


A large pair of scissors

Instructions

Cut the glass piece underwater.

Observe: The glass cuts as if it is a cardboard!!!

INDICATER!!

Acid or Base??


Materials:
15ml unsweetened grape juice
Water
1 Teaspoon baking soda
Vinegar
3 glasses

Instructions

Line up the three glasses in a line.


Pour water into the 1st glass, baking soda into the second glass and vinegar into the third glass.


Now, add some unsweetened grape juice to all the glasses.


Observe: Water gets the colour of the grape juice, which means water is neutral. When grape juice is added to baking soda the colour changes into green indicating it is a base. When the juice is added to vinegar the colour changes to red indicating it is an acid

THE STUCK CUP!!!!!

Can you stick a cup to your hand? Lets see!!


Materials:
A lightweight cup with 2-in. (5cm) base (the cup must have low,circular,bowl shaped depression in thee bottom)
A clean towel
A sponge
Water

Instructions

Place the cup upside down on the towel.

Moisten your left palm with the sponge and water. Your palm should feel moist but not wet.

Place your left palm firmly on the cup's bottom. Rub the back of your left hand. Lean slightly forward as you rub to apply quite a bit of force to your left hand, and after a few minutes lift up your hand........... THE CUP STUCK TO YOUR HAND!!!

After a few moments it comes off