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Fun Science! Experiments - How Does Paper Remain Dry In Water?

Marshall Cavendish Education | Posted on 19 Aug 2020

Experiment setup 

  1. You will need a basin of water, a cup and a piece of paper. 
  2. Crush the paper. 
  3. Squeeze the crushed paper into the dry cup.  
  4. Invert the cup and slowly place it into the basin of water in an upright position.  
  5. Note: Do not slant the cup. 
  6. Observe the water level in the cup.   
  7. Slowly remove the cup from the basin of water in the same upright position. 
  8. Shake off excess water from the cup.  
  9. Remove the crushed paper and observe it. Did it become wet?
     

Questions and Answers

Q1: Why does the paper remain dry even when the cup with paper is submerged in water? 

As air in the cup occupies space and cannot escape, water cannot enter the cup to displace the air. Hence, the crushed paper will remain dry.  

Q2: The water level in the cup rises slightly. Why is it so? 

Air trapped in the cup can be compressed slightly, so some water can enter the inverted cup, causing the water level in the cup to rise slightly.  

READ ALSO: Learn How to Make Rainbow in a Cup!



Q3: The cup must be upright when conducting the experiment, why? 

When the cup is slanted, air can escape from the cup, hence some water can enter to displace the air.  


Want to learn more on science application and the technique to answer exam questions? Here are our recommended titles. Check them out! 

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PSLE Science Revision Guide

PSLE Revision Guide is specially written to help pupils strengthen their understanding of Science concepts and improve their process skills. Filled with easy-to-read notes, diagrams and helpful tips, this book shows pupils how they can revise and prepare for the Science paper in 5 simple steps.PSLE Revision Guide is specially written to help pupils strengthen their understanding of Science concepts and improve their process skills. Filled with easy-to-read notes, diagrams and helpful tips, this book shows pupils how they can revise and prepare for the Science paper in 5 simple steps.

ISBN: 9789814741477


Science Revision Guide Primary 5&6 (2nd Edition) and Primary 3&4

Science Revision Guide is the most complete handbook developed to prepare pupils for success in Science revision. Features of this book are especially designed to help pupils develop a deeper understanding of key Science concepts and to guide them to master the application of process skills.

ISBN: 9789813165960

 

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