Materials required:- ink and 2 glass slides (measuring about 5 cm, and 10 cm. each).

Place the two glass slides one above the other and hold them tight. Put a few drops of ink on a paper and place the bottom edges of the slide on it. See how the ink ascends by itself making beautiful designs. you not reminded of blotting paper absorbing ink? Now separate the slides and wipe the ink. Keep the slides toge­ther, leaving a gap in between. Place the bottom edges of the slide on the ink drops as before. Does the ink ascend now? No! Why? When the slides were tightly placed the space in between them was very narrow. It was acting like a capillary tube. Due to the capillary action the ink ascended up. But when the gap is wide, water is pulled down by the earth and there is no capillary action. Water is ascending up from the soil due to capillary action.

Materials required:– a small mouthed bottle and water.

Take about 1/4 full of water in a bottle. Hold the mouth of the bottle to your mouth and blow hard into it. After blowing  hard enough close the mouth of the bottle with your thumb. Slant the bottle and now the water is touching your thumb. Gently release the pressure of your thumb. See how the water from the bottle jerks out like a fountain. Repeat this many times and enjoy this fun. Care should be taken and the air inside the bottle should not leak. Do not blow and close the bottle after sometime. Compressed air would have been escaped. So you must close the mouth of the bottle as you are still blowing into it.

Why does the bottle spout out? The air blown into the bottle is compressed air. When you tilt the bottle the compressed air pushes the water out. If you do this with a bottle of water without blowing into it, the water will only drip out in jerks.

Materials required: - a glass tube or an ink filler, or a straw. Take one of the above tube. Dip it in water and suck water carefully from the top end. Let not water rush into your mouth. Close the top end with your forefinger immediately. Lift the tube above the water. Does the water in the tube fall down? Gently release your forefinger.
How does water flow down? Lift your finger as you please and let the water flow down. This kind of tube is called the pipette used in laboratories and pharmacies. You can measure various quantities of liquid using the pipettes. The pipettes are available in different sizes.
Why does the water flow down the tube, when you remove the finger? When you lift the tube, air at the bottom of the water column lifts it up. But when you remove your finger and allow the air to enter from the top, air presses the water column from the top. Air pressure at the top and at the bottom is the same. But due to the weight of the column of water it flows down.