👉 A fluid, in its simplest terms, is a substance that takes the shape of its container while maintaining a constant volume and density. This characteristic distinguishes fluids from solids and gases, which do not conform to the shape of their container but instead maintain their volume and density. Examples include liquids like water, oil, and mercury, which flow and can be poured or splashed. The key properties of fluids are their ability to flow and their cohesive nature, allowing them to fill spaces and move from areas of higher pressure to lower pressure. This behavior is governed by principles like viscosity, surface tension, and the ability to mix with other substances.
