Lungs are filled with air and have a lower density than water, causing them to float when submerged in water. The air trapped within the lungs helps them maintain buoyancy in water.
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The lungs are the only organ in the body that are light enough to float on water. This is due to their spongy and air-filled structure.
A drowned child would initially float due to the air trapped in their lungs and clothing. However, as the body decomposes and water fills the lungs, the body would eventually sink.
Air in the lungs increases buoyancy because air is less dense than water. This reduces the overall density of the body, causing it to float more easily in water. The larger the volume of air in the lungs, the higher the buoyant force and the easier it is to float.
Lung tissue is denser than water and will sink when placed in it.
When you swim, your body displaces water and creates an upward force called buoyancy. This buoyant force is greater than your weight, so you float. The more air you have in your body (like in your lungs), the higher you will float in the water.