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1.2

Minor Versionm

by Procheta Mallik

Introduction

An inflated balloon, submerged in a bottle of water can be made to sink by adding minimal weight to it and, its amount of sinking can be controlled by pressure applied to the bottle.

Video Overview

  1. Blow a small amount of air into the balloon (refer to the picture), knot it and tie it up with cotton thread (~10cm).
    • Blow a small amount of air into the balloon (refer to the picture), knot it and tie it up with cotton thread (~10cm).

    • Tie a nut to the other end of the cotton thread.

    • The air blown into the balloon should be just enough to allow the balloon to float when submerged in water with the weight.

    • You can check whether the balloon and nut floats or not in a mug of water.

  2. Carefully insert the balloon and nut into the bottle through its mouth.
    • Carefully insert the balloon and nut into the bottle through its mouth.

    • Fill the bottle with water to the top.

    • Screw the bottle cap on tightly and you are ready to play!

    • Press the bottle from outside and observe what happens to the balloon.

    • Apply and adjust the pressure that you press the bottle with to make the balloon-nut assembly stay suspended in the middle of the bottle.

    • Ensure the bottle is filled to the brim with water

    • If the balloon does not go down after applying pressure, it needs more weight! Add one more nut or remove some air from the balloon.

    • If the balloon does not float, it needs more air or remove some weight.

    • Not applying enough pressure on the bottle.

    • Fill the observation table.

    • Add salt to the water. Observe and record your findings for different amounts of salt.

    • The balloon is connected to the weight, After the weight touches the base what happens if you press the bottle?

    • Fill the balloon with coconut oil instead of air.

    • Replace the balloon by a plastic pen cap. Replace the weight so that the pen cap floats.

    • For more information refer the variation guide.

Finish Line

Attached Documents

Kailash NR

Member since: 05/02/2017

3,385 Reputation

78 Guides authored

One Comment

We need some observation questions....

Procheta Mallik - Reply