I have a very sketchy background in even basic science with very many gaps.
Did you know that if a solid dissolves into a liquid the volume of the water doesn't increase? So you can stir 4 big spoons of salt into, say, 300 ml of water and it will still be 300 ml. This is because the particles of salt fit in the gaps between the water particles. I think this is fascinating.
But if you do it with sand the volume of water does increase because the solid doesn't dissolve.
Now is this because the sand particles are too big? or too heavy? or what?
And by 'particles' does he mean molecules? ie water molecules would be H2O ie 3 atoms?
I've been looking on google to try and find some diagrams of these things, or electron-microscope pictures, but with no real success. Does anyone have any?
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Secondary education
ds1 has been teaching me science (basic chemistry) and it blows my mind
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roisin · 12/10/2008 17:08
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