Final answer:
The statement is true; density is an intensive property defined as the mass of a substance divided by its volume, with the formula d = m/V.
Step-by-step explanation:
The statement that density (d) of a substance is an intensive property that is defined as the ratio of its mass (m) to its volume (V) is true. Density is a characteristic that does not depend on the amount of the substance present, making it an intensive property, unlike extensive properties such as mass and volume, which do depend on the amount of substance.
The formula to calculate density is d = m/V, where d represents density, m is the mass, and V is the volume. This formula is fundamental in determining whether a substance will sink or float in a fluid, which is vital for understanding many physical phenomena.