The relationship between the mass and volume of a liquid is directly proportional. This means that as the mass of a liquid increases, so does its volume. Conversely, as the mass of a liquid decreases, so does its volume.

The mass of a liquid is a measure of the amount of matter it contains, while the volume of a liquid is a measure of the amount of space it occupies. The density of a liquid is defined as its mass per unit volume.

The relationship between mass, volume, and density can be expressed mathematically as follows:

```

mass = density × volume

```

or

```

volume = mass / density

```

For example, if a liquid has a density of 1 gram per cubic centimeter (g/cm³), then a 10-gram sample of the liquid will have a volume of 10 cubic centimeters (cm³).

The relationship between mass and volume is important for a number of reasons. For example, it is used to determine the density of liquids, which is a useful property for identifying and characterizing different liquids. It is also used to calculate the weight of liquids, which is important for shipping and packaging.