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In this one I'm going to talk about mass and volume.

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Mass is the amount of matter and volume is the amount of space.

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For example, these comics are made of paper.

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This comic is more heavy than this one.

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They are solid.

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This box is made of cable and this box is made of wood.

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But this box is more big than this one, but its mass is richer.

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This is a ball. It's made of plastic. And this is a ball. It's made of plastic too.

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But its volume is bigger than this one. They are solid.

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This is a wheel. It's made of paper.

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This is a battery. It's made of metal, plastic and lithium. The bill is more light than the battery, but its mass is greater.

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These things are small, but the rock is more heavy. Its mass is greater. They are two bottles. One is full of water and this one contains gases. It's not empty.

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Gases have weight and contains unoccupied space.

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The water is liquid.

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Another state of the water is the gaseous.

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When the water boils off, we can see its gases.

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It's magic!

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Bye! See you later!