A piece of ice is floating in a glass tumbler filled with water up to the brim. Will the water overflow after the had melts.? Part-I
Posted by Bharath at 3:32:00 AMYou know all substances expand when heated and contracts when cooled. However, the mass of the substance whether hot or bold, remains the same.
Let us consider melting. When a solid melts, its volume go the liquid state is usually more than its original volume in the solid state. Since the mass remains the same, the above statement means that solids are generally denser than their liquids. You must have seen hair oil freezing on a bold winter day. As a part of the oil freezes, the frozen park sinks in the oil. Water, however, is an exception to this rule. When water becomes ice, its volume increases. Since the mass does not change, ice, which occupies more volume of the same mass is lighter, that is less dense, than water. Naturally, ice floats on water. In fact, whenever you see an object floating on a liquid, you can be sure that the density of the object is less than that of the liquid.
Density is defines as mass/volume. Density me water is 1 gm/cm3, that is 1cm3 volume of water weighs 1gm. The density of ice is only 0.9 gm/cm3, that is, a block me ice measuring 1cm x 1cm x 1cm weighs 0.9 gm. Now let up recall the law of floating objects. When an object floats in water, the weight of water displaced by the immersed portion of the object is equal to the weight of the entire object.
