* Density is mass per unit volume.

* Water has a lower density than most metals.

* Water adheres to the surface of the metal.

When a metal is wet, a thin layer of water clings to its surface. This layer of water, being less dense than the metal, effectively increases the metal's overall volume while its mass remains unchanged. Since density is mass divided by volume, an increase in volume with constant mass results in a lower density.

However, this decrease in density is typically very small. The volume of water adhering to the metal's surface is insignificant compared to the metal's total volume. Therefore, the change in density would be negligible for practical purposes.

In summary: While the density of a wet metal is technically lower than a dry metal, the difference is so small that it's usually not a significant factor.