👉 Enclosed fluid, also known as an enclosed liquid or a fluid-filled cavity, refers to any space within a structure or object that contains a liquid. This fluid can be water, oil, blood, or any other substance, and it serves various purposes such as cushioning, lubrication, temperature regulation, or providing nutrients. In biological contexts, enclosed fluid like blood circulates through vessels within the body, while in mechanical systems, it might be found as hydraulic fluid or lubricant. The enclosed nature of this fluid ensures it remains contained, maintaining its properties and functions within the defined space.