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1.4

Minor Versionm

by Procheta Mallik

Introduction

Attach given small balloons to two pieces of straws and glue the straws together to form a Y shape. Fix this straw-balloon assembly in a plastic bottle through the bottle cap. Cut the bottle and fix the bigger balloon on the mouth of the bottle cutout. Stretch the big balloon to see the small balloons inflate.

Video Overview

    • Exercise caution while using scissors/cutter.

    • Do not use flame near readily inflammable liquids or gas containers.

  1. Take a Water bottle and cut it at the 1/4th height from the cap as shown in the figure. Take the bottle cap and make a hole at the centre of the cap. You may heat a thick wire in a candle flame for 20 seconds to make this hole.
    • Take a Water bottle and cut it at the 1/4th height from the cap as shown in the figure.

    • Take the bottle cap and make a hole at the centre of the cap.

    • You may heat a thick wire in a candle flame for 20 seconds to make this hole.

    • Or you may make the hole using scissor.

    • Use scissors to make the hole big enough for 2 straws to be inserted in that hole.

  2. Take two bendable (articulated) straws. Use insulation tape and tape the two straws together on the top end of the straw and the bottom end of the straw to look like Y shape.
    • Take two bendable (articulated) straws.

    • Use insulation tape and tape the two straws together on the top end of the straw and the bottom end of the straw to look like Y shape.

    • Secure two small balloons to the bending ends of straws and secure them using an insulation tape.

    • Now cut the excess length of the straws to fit in the bottle you have chosen .

  3. ake a Big Balloon and cut the top portion upto the neck of the balloon. Save the neck portion of the balloon for later use. Take the small balloons and straws assembly and pass through the hole in the bottle cap. Screw the cap to the bottle tightly. Fix the big balloon piece to the bottom of the bottle. Secure it using tape.
    • ake a Big Balloon and cut the top portion upto the neck of the balloon. Save the neck portion of the balloon for later use.

    • Take the small balloons and straws assembly and pass through the hole in the bottle cap. Screw the cap to the bottle tightly.

    • Fix the big balloon piece to the bottom of the bottle. Secure it using tape.

  4. Take the previously cut balloon neck and slide it around the straws and on the cap. Using a rubber band secure the balloon neck around the straws to make the model air tight .
    • Take the previously cut balloon neck and slide it around the straws and on the cap.

    • Using a rubber band secure the balloon neck around the straws to make the model air tight .

  5. INHALATION - when the diaphragm is pulled down . The lungs (balloons) are filled with air and hence expand. EXHALATION - when the diaphragm is pushed up . The lungs (balloons) push the air out, hence  contract.
    • INHALATION - when the diaphragm is pulled down . The lungs (balloons) are filled with air and hence expand.

    • EXHALATION - when the diaphragm is pushed up . The lungs (balloons) push the air out, hence contract.

    • Click on this Lungs-Diaphragm Model (Variations) for further exploration.

    • Hole in the cap is too big which lets air in while stretching bigger balloon and because of this small balloons don't inflate.

    • Diameter of cut part of bottle is too small to hold the big balloon tightly.

  6. Answer
    • Answer

    • In this variation you can replace two smaller balloons (lungs) with one big balloon. This shows the expansion and contraction of the lungs more precisely.

    • In this variation the material used to represent the diaphragm is changed from the balloon to soft plastic .

    • In this variation the size of the balloons that represent the lungs are getting changed from small volume to large volume to show the difference between adult lungs and baby lungs.

    • Click on this Lungs-Diaphragm Model (Variations) for further exploration.

Finish Line

Kailash NR

Member since: 05/02/2017

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