👉 A fluid, in the context of physics and chemistry, is a substance that takes the shape of its container but not its volume. It flows easily and can move from areas of higher pressure to lower pressure, often due to temperature changes or mechanical force. Common examples include liquids like water, oil, and blood. Unlike gases, which have a fixed volume and can expand to fill any container, fluids maintain their volume but can change shape to fit their surroundings. This behavior is crucial in many natural and industrial processes, from the circulation of blood in our bodies to the operation of hydraulic systems.
