That depends what substance you are talking about. You have to multiply the volume by the density of the substance.
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To determine mass, you also need the density of the substance. Mass = volume x density. Without the density, we cannot calculate the mass.
The density is calculated by dividing the mass by the volume. In this case, the density would be 80g / 20cm^3 = 4 g/cm^3.
In order to determine the mass of the water sample, you would need to know the density of water. The density of water is approximately 1 g/cm3. Therefore, the mass of a 20 cm3 sample of water would be 20 grams (20 cm3 * 1 g/cm3 = 20 grams).
The density of the object can be calculated by dividing the mass (40g) by the volume (20 cm³). Therefore, the density of the object is 2 grams per cubic centimeter (g/cm³).
density is found by dividing mass by volume.................................
The mathematical relationship between mass 'm' and volume 'V' is that the ratio of these two quantities is equal to the density. The ratio of a substanceâ??s mass and volume is given as mass per unit volume. Density is a physical property of a substance.