The Dead Sea has an extremely high salt concentration, which makes the water very buoyant. This high salt content makes it nearly impossible to sink or drown.
When you enter the Dead Sea and lie on your back, you will naturally float on the surface due to the buoyancy provided by the high salt concentration. Buoyancy is the upward force exerted by a fluid on an object submerged or floating in it. The buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.
When an object is less dense than the fluid it is placed in, it will float because the upward buoyant force is greater than the downward force of gravity. For example, a wooden block floats in water because it is less dense than water, and the buoyant force is greater than its weight.
On the other hand, if an object is denser than the fluid, it will sink because the downward force of gravity is greater than the upward buoyant force. A rock sinks in water because it is denser than water, and the weight of the rock is greater than the buoyant force.
When you enter the Dead Sea, the high salt concentration makes the water denser than your body, resulting in a significant increase in buoyant force. This buoyant force pushes your body upward, making it nearly impossible to sink or drown. In fact, you will naturally float on the surface without any effort, with your body partially or entirely exposed above the water.