How do you know if an object will sink or float in water based on their densities?

An object will float in water if its density is less than that of water (approximately 1 g/cm³). Conversely, if the object's density is greater than that of water, it will sink. This principle is based on buoyancy, where an object displaces a volume of water equal to its own weight; if the weight of the water displaced is greater than the object's weight, it will float.