A liquid is one of the four fundamental states of matter (the others being solid, gas, and plasma). It has a definite volume but no definite shape. Unlike a gas, a liquid does not expand to fill any container it is placed in. Instead, it takes on the shape of the container. Liquids have the ability to flow and can be poured. They also have a free surface in a gravitational field, which makes them distinguishable from gases.
Some common examples of liquids include water, milk, juice, oil, vinegar, and alcohol.
Liquids can change to a solid state through a process called freezing, and to a gas state through a process called evaporation or boiling. The temperature at which a liquid changes to a gas is called its boiling point, while the temperature at which it changes to a solid is called its freezing point.
Here are some key points to remember about liquids: