How can you use density to determine if an object will float or sink in a liquid?

An object will float in a liquid if its density is less than the density of the liquid, while it will sink if its density is greater. This principle is based on buoyancy; when the weight of the displaced liquid is greater than the weight of the object, the object floats. Conversely, if the object's weight exceeds the buoyant force provided by the displaced liquid, it sinks. Thus, comparing densities allows you to predict the object's behavior in the liquid.