👉 A fluid, in the context of physics and chemistry, is a substance that takes the shape of its container while maintaining a constant volume. This means fluids can flow and adapt to the shape of their surrounding space, unlike solids which have a fixed shape and volume. Examples of fluids include liquids like water, oils, and blood, as well as gases such as air. The key characteristic of fluids is their ability to flow and fill any open space, which is due to the cohesive forces between molecules and the lack of a fixed internal structure. This behavior is fundamental in understanding various natural phenomena, from weather patterns to the movement of blood through the circulatory system.
