Difference Between Density & Mass

Specific density describes the mass of a substance per unit of volume.
••• Hemera Technologies/Photos.com/Getty Images

Mass and density are two commonly used physical properties of objects in physics that are very similar and share a close mathematical relationship. Mass and density should not be confused with weight.


Mass is a measure of how much matter there is within an object, typically given in grams. Mass is not affected by gravity, so a given object would have the same mass on Earth as in outer space.


Density is the amount of mass in an object per a certain amount of volume. Water has a density of 1 gram per cubic centimeter.


The mathematical relationship between mass and density is often given by the formula: Density=Mass/Volume. This can be rewritten Mass=Density x Volume.


Weight is the force of the gravity that acts upon an object's mass. In the absence of gravity, objects have no weight.

Matter States

Matter can come in liquid, solid or gaseous forms. Matter state often has a large impact on density, as gases tend to be far less dense than liquids or solids.

Related Articles

Importance of Density
How to Convert Density to Force per Cubic Meter
How to Calculate Weight by Volume
How to Convert Density to Grams
Density Vs. Concentration
How to Determine Density
How to Calculate the Mass of a Solid
How to Find Mass From Density
How to Calculate Buoy Floatation in the Water
How to Convert Specific Gravity in Weight
How to Calculate Concentration From Density
How to Calculate the Density of a Mixture
Conversion of LBM to Gallons
What Is the Difference Between Mass, Weight and Volume?
How to Convert Volume From Density
Gallons to Kilograms Conversion
Density to Molarity Conversion
How to Calculate Percent Solids by Weight