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Science

Waterproofing

 

Today's investigation is a fun, waterproofing activity! The idea is to colour in each dinosaur and then cover them with different test materials. Once each dinosaur is completely covered, spray with water and uncover to see which dinosaur is the driest!

 

Materials which do not absorb water are said to be 'waterproof'. An umbrella made from paper, or a pan made from chocolate wouldn't be very helpful so it's handy to know the properties of materials when making something new.

 

You will need:

  • different materials to test e.g. kitchen roll, paper, card, kitchen foil, parchment/grease proof paper, wax crayon, rubber glove etc.
  • masking tape or blue tac
  • scissors
  • dinosaur printable or draw your own pictures (it doesn't have to be a dinosaur!)
  • felt tip pens
Picture 1

Instructions

 

  • First colour in the dinosaurs using felt tips.

  • Next ask an adult to help you cut out small rectangles of different materials to put over the dinosaurs. You need one for each dinosaur. Try to choose some materials you know are waterproof, some you know are not and some you’re not sure about.

  • Carefully tape the rectangles over each dinosaur. Try using masking tape, but anything you can peel off easily should work.

Picture 1
  • Spray each dinosaur with the same amount of water. 1 or 2 sprays should be plenty. If you don’t have a sprayer just drop water instead. Remember you should use the same amount of water each time.

 

  • Look carefully at the materials you’ve sprayed, check to see if the water is sitting on the top or has been absorbed by the material. If you can see the water on top, the material is waterproof.

Picture 1
Picture 2

Results

 

What are your results? Which materials were the most waterproof? Were there any surprises?

 

What is a material?

 

Materials are all the different types of stuff that makes up everything in the Universe. Rocks, trees, water, food, toys, people, animals, clothes and even planets are all made of materials.

 

All materials are made up of tiny ( so tiny you can’t see them ) building blocks called atoms. Everything you touch and hold is made of atoms.

 

Very simply the word material just means what an object is made from. Examples of materials are plastic, metal, wood, cotton, paper etc.

 

Different materials have different properties, which make them useful for different things. For example, glass is used in windows because we can see through it ( it is transparent ). Bricks are used for houses as they are strong and gold doesn’t rust so is handy for making jewellery.

 

Natural Waterproof Materials

 

Rubber and wax are examples of natural waterproof coatings. Leaves often have a waxy coating to protect the leaf and help it retain water.

 

 

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