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by Procheta Mallik

Introduction

Where is the pressure of water higher: on the ground floor or the top storey of a building? Here we create a scenario with two bottles and some straw pieces replicating that scene!

    • Handle the scissors/cutter with care

  1. Use 2 identical bottles, preferably small ones, about 200-300ml in volume Take long straw as 15cms and other 3 small straws of 3cms Using scissors, make 2 holes on each of the caps so that the stiff straws fit in snugly
    • Use 2 identical bottles, preferably small ones, about 200-300ml in volume

    • Take long straw as 15cms and other 3 small straws of 3cms

    • Using scissors, make 2 holes on each of the caps so that the stiff straws fit in snugly

    • Both caps will have 2 holes on each, almost like eyes!

  2. Fix two of the small straws in one of the bottle caps, as shown in the  picture, such that they protrude at different heights from the top Fix the full straw and the other small piece on the other bottle cap. Make sure that in both bottle caps, the level of the protrusion of the shorter straws is the same on the outside.
    • Fix two of the small straws in one of the bottle caps, as shown in the picture, such that they protrude at different heights from the top

    • Fix the full straw and the other small piece on the other bottle cap.

    • Make sure that in both bottle caps, the level of the protrusion of the shorter straws is the same on the outside.

    • Fill the bottles with water (preferably coloured to make it more fun and visible!) till the brim and screw the caps on tightly

  3. Invert the full bottles simultaneously over a receptacle, or sink, or outdoors What happens next?? What happens next??
    • Invert the full bottles simultaneously over a receptacle, or sink, or outdoors

    • What happens next??

    • Do the bottles empty at all? At the same rate?

    • If not at the same rate, which one empties first? Why?

    • Why are two straws put in each bottle cap?

    • Try emptying the bottle using only one straw!

    • The bottles are not of identical volume

    • Holes on the bottle caps should be tight enough to hold the straws; if they aren't, you can glue the gaps

    • The bottles were not inverted simultaneously

    • The straws get squeezed in the bottle cap holes, thereby preventing an outflow altogether

    • Small straws of equal length

    • Straws not aligned properly inside the bottle cap

Finish Line

Suchitha Vishwa

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