fjrigjwwe9r3kidz_content:n_desc Materials Required An empty plastic bottle How to do it Make three small holes in one of the sides near the bottom of the bottle about 1/2 cm away from each other. The holes should like on the same height. Fill the bottle full with water and ask the child to observe the water streams coming out of the holes. Bring the streams together with the fingers to make it one big stream. Seperate the streams by pushing one finger through the middle of the large stream. Explanation The closer the holes are placed in the bottle, it is easier to get a whole stream out of it, but it is harder to seperate it into three seperate streams. The farther the holes are, the harder to bring the separate streams together. It is because of the cohesive forces between the water molecules that keep the streams together. The fuller the bottle, the larger the pressure and the easier to obtain seperate streams. With less water in the bottle, we will get lower water pressure and thus an easier cohesive whole stream.
How to do it
Explanation