👉 A fluid, in its most general sense, is a substance that takes the shape of its container while maintaining a consistent volume and density. This means fluids can flow from areas of higher pressure to lower pressure, allowing them to move and fill any space they occupy. Common examples include liquids like water, oil, and blood, which can change shape to fit various forms but always retain a defined volume. Unlike gases, fluids do not compress significantly under pressure and can flow smoothly without resistance, making them essential for processes like circulation in living organisms and various industrial applications.
