Question

In general, when a substance changes from a solid to a liquid,
A.
the substance no longer has density since density is a property only solids have.
B.
the density of the substance decreases.
C.
the density of the substance remains the same.
D.
the density of the substance increases.

Answer 1

When a substance changes from a solid to a liquid, the most accurate statement is:

**B. the density of the substance decreases.**

This is because most substances, when they melt, have a lower density in the liquid state compared to the solid state. Water is a notable exception, as it becomes less dense when it freezes, which is why ice floats on water. However, in general, many materials do experience a decrease in density upon melting.