You can find the mass of a substance using its density and volume with the following formula:

Mass = Density × Volume

Here's how it works:

* Density is a measure of how much mass is contained in a given volume. It's typically expressed in units like grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

* Volume is the amount of space a substance occupies. It's usually measured in cubic units like cubic centimeters (cm³) or liters (L).

Example:

Let's say you have a substance with a density of 2 g/cm³ and a volume of 5 cm³.

* Mass = 2 g/cm³ × 5 cm³

* Mass = 10 grams

Therefore, the mass of the substance is 10 grams.