Matter - anything that has weight and takes up space, Properties - characteristics or attributes, Density - a property of matter that measures how close together particles in a substance are, Solubility - a property of matter that measures how well one thing can dissolve into another, Conductivity - a property of matter that measures how well something can allow electricity to flow through it, helium - a gas with no color or smell that is less dense than air, sulfur hexaflouride - a gas that is six times more dense than air,

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