When the density of an object is less than that of the substance in which it is immersed, the object will float. This is because objects with lower density are less dense than the surrounding fluid, causing them to be buoyant and rise to the surface.

One of the most common examples of this phenomenon is a boat floating on water. The density of the boat is less than that of the water, allowing it to stay afloat. This principle is also why ice cubes float in a glass of water - the density of ice is less than that of liquid water, causing the ice to float on top.

Objects that are less dense than the fluid they are placed in will experience an upward force known as buoyancy. This force is equal to the weight of the fluid that the object displaces, which allows the object to float. This is why even heavy objects like ships can float on water, as long as their overall density is less than that of the water.

Understanding the concept of density and buoyancy is crucial in various fields, including physics, engineering, and even everyday life. By knowing how objects interact with fluids based on their densities, scientists and engineers can design and build structures that float, such as boats and submarines.

For more information on the relationship between density and buoyancy, you can visit websites such as Khan Academy and Encyclopedia Britannica. These resources provide in-depth explanations and examples of how density and buoyancy work together in various scenarios.

In conclusion, when the density of an object is less than that of the substance in which it is immersed, the object will float due to the buoyant force acting upon it. This fundamental principle of physics plays a crucial role in many aspects of our daily lives and is essential for understanding how objects interact with fluids.

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