Definition:Scalar Quantity

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This page is about scalar quantity. For other uses, see Scalar.


A scalar quantity is a real-world concept that needs for its model a mathematical object which contains only one (usually numeric) component.



The mass of a body is a measure of how much matter it contains.

Mass is equivalent to inertia.

Mass also determines the degree to which a body creates or is affected by a gravitational field.

It is a scalar quantity.


Volume is the measure of the extent of a body.

It has three dimensions and is specified in units of length cubed.


Density is a physical quantity.

The density of a body is its mass per unit volume.


The speed of a body is a measure of the magnitude of its velocity, taking no account of its direction.

It is, therefore, a scalar quantity.


Temperature is a physical property of matter that quantifies how hot or cold a body is.

It is a scalar quantity which can be mapped directly to the real number line.

Electric Potential

An electric potential is the amount of work needed to move a unit of electric charge from a given reference point to a specific point in an electric field without producing an acceleration.

The reference point is usually either Earth or a point at infinity, although any point can be used.

Electric Charge

Electric charge is a physical quantity of matter which causes it to experience a force when near other electrically charged matter.

It is a scalar quantity.

Entropy (Physics)

Entropy is a property of a thermodynamic system.

It quantifies the number $\Omega$ of microstates that are consistent with the macroscopic quantities that characterize the system.

Also see