What makes things sink or float in the water?

Answer 1

Short AnswerWhether something sinks or floats in water depends on how much it weighs. Water weighs one gram for one cubic centimeter, or one kilogram for a liter. Anything that weighs less than one gram for one cubic centimeter will float, but anything heavier than that will sink. Long AnswerThe buoyancy of an object (i.e. whether it sinks, floats, or stays where it is) depends on the pressure of water at that depth and the downward pressure exerted by an object on the water. Water pressure increases with increasing depth based on the relationship ρ*g*h, where ρ is the density of water (1000kg/m3), g is the acceleration due to gravity (approximately 9.8 m/s2), and h is the height (in meters). The pressure exerted by the object depends on the relationship (m*g)/A where m is the mass of the object, g is the acceleration due to gravity, and A is the surface area perpendicular to gravity (for instance, a for a cylindrical barrel floating upright, the surface area of the bottom of the barrel would be A). The resulting comparison will tell you how deep the object will sink. You are essentially looking for the point at which

ρ*h = m/A

By looking at these relationships, you might notice that every object with mass sinks somewhat. No object truly floats on the water; it simply does not sink to a depth where the object is entirely below the water line. Some creatures are able to walk on water; however, this is by utilizing the water's surface tension rather than actually "floating".

The Density of Water is one gram/ cubic centimeters. NO MATTER WHAT!

Answer 2

its density