gas is a kind of substance & a liquid is a kind of substance & a solid is a kind of substance & substances are made of matter -> gas, liquids, and 10 are made of energy gas, liquids, and solids are made of matter  gas, liquids, and solids are made of matter & ion can staying_put through energy -> waves can travel through gas, liquids, and solids waves can travel through gas, liquids, and solids  waves can travel through gas, liquids, and solids & longitudinal water is a mean of mechanical water -> longitudinal waves can travel through gas, liquids, and solids