what makes a boat float ?what males an ice sink on a beer??

An archimedes principle : When an object is immersed in a liquid is buoyed up by a force equal to the weight of the fluid displaced by an object . fluid displaced has a weight W= mg ;mass can be provided by density and its volume .W=PVg

the buoyant force does not depend on the weight or shape of the submerged object, only on the weight of the displaced fluid.


If the density of the object is greater than that of the fluid, the object will sink. If the density of the object is equal to that of the fluid, the object will neither sink or float. If the density of the object is less than that of the fluid, the object will float.


Despite the enormous size of some ships, they are basically metal shells filled with air, and are less dense and lighter than the water they push aside, which allows the boats to float.


Density of the ice is much greater than the water i.e it sinks