Depending on where you live: mass would be grams and kilograms in metric or ounces and pounds in US customary or imperial.
Volume could be liters, cubic centimeters, milliliters. Or fluid ounces, tablespoons, gallons, cubic inches, cubic feet.
Density can be: grams/milliliter, kilograms/liter, or pounds/cubic foot.
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Density is the mass in a unit volume and has the units of kgm-3. Mass length is the mass in a unit length and has units of kgm-1. Volume is measured in m3.
a fundamental unit is kg or m - (also seconds, amps, candela and moles). Density is kg/m3 and is thus derived.
Volume is the space occupied by an object or substance. When working with density, volume is important because density is defined as mass per unit volume. By knowing the volume of a substance and its mass, you can calculate its density.
The volume of the substance can be calculated using the formula: volume = mass/density. In this case, the volume would be 80/40 = 2 cubic units.
The unit of length in SI is metre (m). The unit of mass in SI is kilogram (kg). The unit of volume in SI is litre (L). The derived unit of density in SI is Mg/m3 (or g/cm3). Length, mass, density, volume are not units but characteristics of materials and objects.
To convert volume to mass, you need the density of the substance. Multiply the volume by the density to get the mass using the formula: mass = volume x density. The units of volume and density must be compatible for accurate conversion.