Science Master Special – Hardness List

List of materials

wood (balsa)
wood (oak)
plastic object
bath sponge
china(cups and saucers)
glass
concrete pathway
cardboard
metal fork
coin
rock (sandstone)
piece of coal
pencil rubber

My hypothesis (idea ) is that the hardest material will be the metal. I have decided to test this by using a metal nail and trying to scratch all the samples on the list. The ease of the scratch will be linked to the softness of the material. These are the results of my test from softest to hardest.

bath sponge
cardboard
pencil rubber
Balsa wood
plastic object
wood (oak)
rock (sandstone)
piece of coal
concrete pathway
coin
metal fork
china (could not scratch)
glass (could not scratch)

Like to add some more examples …let me know by using the Reply Box.

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