A LEMONADE-STRAW CAN GO THROUGH A POTATO!!!!

Let's try to make a lemonade-straw go through a potato!


Materials:


A potato (Not boiled)


A lemonade-straw

Instructions

Just try to insert the straw through the potato. Does the straw goes through?? No it does not.

Now cover the top opening of the straw with your finger (as shown in the figure below) and strike the potato quickly with the straw and apply the maximum amount of force you can, but be sure the straw is perpendicular to the potato. Does the straw go through??? Yes it does!! 

The straw goes through!!

What happens???

You are holding the potato in your hand; so it is at rest. It is inert. The straw which strikes the potato has a great impulse of force. The pressure of the compressed air inside the straw (which occurs when your finger is covering the top opening of the straw) will keep it hard. That is why the straw goes through!  

HOW DO SOIL LOOSE THEIR NUTRIENTS DURING LOTS OF RAIN???

Do you know soil loose their nutrients during lots of rain or excessive
water?? Let's see how!


Materials:
1/2 cup of dry soil


Blue powdered tempera paint


A measuring spoon


A measuring cup


A wide mouthed jar


Coffee filter paper


A few cups


Water

Instructions

Mix 1/4 teaspoon of blue tempera paint to 1/2 cup of soil thoroughly.

Set the funnel into the jar and put the coffee filter paper into the funnel.

Now pour the soil mixture into the funnel and add 1/2 cup water into the funnel.

Observe the color of the water. Repeat the experiment again and again without changing the soil, but do change the container and the filter paper

Observe: After some time the water coming in to the jar will be clean and transparent. At first the water will be in blue in color, but as you repeat the process the water will become more transparent

This process happens with soil in the nature. The blue powdered tempera color can be thought as nutrients in soil!