What is the force opposing gravity in a fluid known as?

The force opposing gravity in a fluid is known as upthrust, which is also referred to as buoyant force. This force acts upward against the weight of an object submerged in a fluid, allowing objects to float or appear lighter when in a fluid. Upthrust is generated due to the pressure difference exerted by the fluid on different parts of the submerged object, resulting in an upward force that opposes the downward force of gravity. This principle can be observed in various scenarios, such as boats floating on water or balloons rising in the air. Understanding upthrust is crucial in fields such as physics, engineering, and fluid mechanics, as it plays a significant role in the behavior of objects in fluids.