Liquid state refers to one of the three primary states of matter, alongside solid and gas. In this state, molecules are closely packed but can move freely, allowing liquids to take the shape of their container. Common examples of liquids include water, oil, and alcohol. The properties of liquids include a definite volume but no fixed shape, meaning they can flow and adapt to their surroundings. The behavior of liquids is influenced by factors such as temperature and pressure, which can lead to changes in state, such as evaporation into gas or freezing into solid.