vibration - quickly moving back and forth (or up and down), medium - a substance that something moves through (a solid, liquid or a gas), vacuum - a space completely empty of matter, speed of sound - how fast the wave or vibrations pass through the medium or matter, speed of light - the fastest speed that all energy and matter in the universe can travel, density - how compact a substance is, solid - firm in shape, not liquid or fluid, liquid - this can change its shape by flowing, gas - this can expand to fill the whole of a container, it has no fixed shape and no fixed volume, matter - - everything around you. Anything that take up space is called matter. Air, rocks, water and even people are examples of matter. Atoms and compounds are all made of very small parts of matter.,

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