Liquid/ˈlɪkwɪd/ Definition 1 of 5Pro Tip 1/3Physical Properties Liquids have no fixed shape but a fixed volume; they're not just water. Oil, like water, is a liquid that takes the container's shape. Pro Tip 2/3Not Always Safe Some liquids can be dangerous, like acids or boiling liquids. The liquid in the battery is corrosive. Pro Tip 3/3Sensory Characteristics Liquids have various features; they can be colored, odorless, or tasteless. This clear liquid has a strong scent.