Why does an object's density determine whether it sinks or floats?

In Grade 8 Science, one of the key concepts is understanding why objects sink or float in liquids. This phenomenon is determined by the density of the object compared to the density of the liquid. According to the principle of Archimedes' law, an object will float if its density is less than the density of the liquid it's placed in. On the other hand, if the object's density is greater, it will sink. This fundamental principle helps students grasp the relationship between matter and density, laying the groundwork for more advanced scientific concepts.