# Density vs. Volume: What's the Difference?

Edited by Harlon Moss || By Janet White || Published on January 16, 2024
Density is mass per unit volume of a substance, while volume is the amount of space an object occupies.

## Key Differences

Density refers to how closely packed the particles of a substance are. In contrast, volume measures the total space that a substance or object occupies.
The density of an object remains constant at a given temperature and pressure, irrespective of its size. Volume, however, can vary greatly depending on the size and shape of the object.
Density is a property that helps determine whether an object will float or sink in a fluid. Volume is a measure used to determine how much space an object or substance fills.
Density is expressed in units like grams per cubic centimeter (g/cm³), while volume is measured in units such as liters or cubic meters.
Density is an intrinsic property of a material and does not change unless the material's composition changes. Volume can change with alterations in temperature and pressure.

## Comparison Chart

### Definition

Mass per unit volume
Amount of space occupied

### Measurement Units

G/cm³, kg/m³, etc.
Liters, cubic meters, etc.

### Dependence

Independent of size and shape
Dependent on size and shape

### Changes With

Composition changes
Temperature and pressure changes

### Physical Relevance

Determines buoyancy, sinking or floating
Determines capacity, space occupancy

## Density and Volume Definitions

#### Density

Density is the mass of a substance per unit volume.
Lead has a higher density than aluminum.

#### Volume

Volume is the measure of space an object or substance occupies.
The volume of the tank is 2000 liters.

#### Density

Density indicates how compact a substance's particles are.
The density of a neutron star is incredibly high.

#### Volume

Volume can be calculated using geometric formulas.
The volume of a sphere is calculated as 4/3πr³.

#### Density

Density can vary within a substance, creating gradients.
Earth's atmosphere has a density gradient, decreasing with altitude.

#### Volume

Volume is used to measure the capacity of containers.
The bottle has a volume of 1.5 liters.

#### Density

Density determines an object's buoyancy in a fluid.
Objects with a density less than water float.

#### Volume

Volume quantifies the extent of an object in three dimensions.
The room's volume is 72 cubic meters.

#### Density

Density is a characteristic property of a material.
Gold's density helps in distinguishing it from fake imitations.

#### Volume

Volume is a common measurement for liquids and gases.
She measured out 100 milliliters of milk.

#### Density

The quality or condition of being dense.

#### Volume

A collection of written or printed sheets bound together; a book.

#### Density

The quantity of something per unit measure, especially per unit length, area, or volume.

#### Volume

One of the books of a work printed and bound in more than one book.

## FAQs

#### How is density calculated?

Density is calculated as mass divided by volume.

#### Does density change with temperature?

Yes, for most substances, density decreases as temperature increases.

#### Can density be used to identify a substance?

Yes, density is a characteristic property that can help identify substances.

#### What units are used for density?

Common units include grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

#### Is density the same as weight?

No, density is mass per volume, while weight is the force of gravity on an object.

#### What affects the density of a material?

Composition, temperature, and pressure can affect density.

#### What is density?

Density is the mass of a substance per unit volume.

#### Why do objects float or sink based on density?

Objects float if their density is less than the fluid they are in, and sink if more.

#### Can two objects have the same density but different masses?

Yes, if they have different volumes.

#### How is the volume of a liquid typically measured?

Usually with a graduated cylinder, measuring cup, or beaker.

#### How does density relate to buoyancy?

Buoyancy depends on the density difference between an object and the fluid it’s in.

#### What is volume?

Volume is the amount of space an object or substance occupies.

#### How is volume measured?

Volume can be measured in liters, cubic meters, cubic centimeters, etc.

#### Does the shape of an object affect its volume?

Shape doesn’t affect volume, but it determines how volume is calculated.

#### Can volume change with temperature?

Yes, most substances expand when heated, increasing their volume.

#### How do you find the volume of an irregular object?

By displacement method: measuring the volume of fluid displaced by the object.

#### How is the volume of a gas measured?

Typically by the space it occupies at a given temperature and pressure.

#### Is volume the same as capacity?

Capacity refers to the volume that a container can hold.

#### What is the difference between volume and area?

Volume measures three-dimensional space, while area measures two-dimensional space.

#### Does volume affect an object’s density?

Volume is part of the density calculation, but doesn’t directly affect density.