👉 A fluid is a substance that takes the shape of its container and flows easily. This characteristic distinguishes fluids from solids and gases; unlike solids, which maintain a fixed shape and volume, or gases, which expand to fill any container, fluids adapt their form to the space they occupy. There are four primary states of matter, but fluids specifically refer to liquids and gases, both of which exhibit this fluidity. Liquids, like water, have a definite volume but take the shape of their container, while gases, such as air, expand to fill any available space, losing their fixed shape. This fluid nature is fundamental to the behavior of all matter in our observable universe, influencing everything from the movement of liquids in pipes to the flow of blood in our bodies.
