What would happen to the density of hershey bar if you melted whole bar?

The density of a substance is defined as its mass per unit volume. When you melt a Hershey's bar, its mass remains the same, but its volume increases. This is because the chocolate molecules become less tightly packed when they are melted. As a result, the density of the melted Hershey's bar decreases.

To be more precise, the density of a substance is calculated as:

Density = mass/volume

In this case, the mass of the Hershey's bar remains constant, whether it is solid or melted. However, the volume of the melted bar increases because the chocolate molecules become more spread out and less densely packed. This means that the denominator of the density equation (volume) increases, which in turn causes the overall density value to decrease.

In summary, when a Hershey's bar is melted, its density decreases because its volume increases while its mass stays the same.