Why does salt make objects float?
Type “floating objects in salt water” into your yahoo web search. It will give you a page of websites that will really help you Because it increases the density of the water. When anything floats, it is because the vertical forces acting on it sum to zero. Sir Isaac Newton told us this in his Third Law of Motion. Objects feel a downward force due to their weight. The balancing upward force on an object in a fluid is called a buoyant force. Archimedes is credited with the first understanding that the buoyant force is equal to the weight of the fluid that is displaced. On average, sea water is 3% denser (more mass per unit volume, thus more weight per volume) than fresh water, so less of it must be displaced to provide a buoyant force sufficient to balance the weight of the object. This is why floating is easier in salt water than in fresh. There is a very famous principle in Physics, known as Archimedes Principle, which states that the amount of liquid displaced by a floating object has
