If a steel-density is 7.8g\cm is put in water, will it float or sink

Sink

To determine if the steel will float or sink in water, you need to compare its density with the density of water. If the density of the object is greater than the density of water, it will sink. If the density of the object is less than the density of water, it will float.

In this case, you're given that the density of steel is 7.8 g/cm³. The density of water is approximately 1 g/cm³. Since the density of steel is greater than the density of water, the steel will sink in water.