## What is Flux?

### Types of Flux

Flux can be used in various concepts, such as

#### Magnetic Flux

It means the number magnetic field lines passing through a closed surface. Its SI unit is – Weber and in CGS is – Maxwell. It is denoted by φ_{M}.

#### Electric Flux

It means the number of electric field lines passing through a closed surface. Its SI unit is – volt meter. It is denoted as φ_{E}.

#### Luminous Flux

It means the line of transmitted visually sensible radiated energy per second. Its SI unit is Lumen (l_{m}).

#### Radiant Flux or Energy Flux

It means the line of transmitted radiated energy per second from any energy source. Its SI unit is Watt. It is denoted as φ_{V}.

#### Heat Flux

It means the heat energy transfer through an elementary surface per second. Its SI unit is W/m^{2}. It is denoted as Φ_{q}.

#### Mass Flux

It means the rate of mass flow per unit area. Its SI unit is kg/s-m^{2}. It is denoted as J or q.

#### Momentum Flux

It means flow of momentum across unit area per second. Its SI unit is N/m^{2}.

#### Acoustic Flux

It means flow of sound energy through unit area per second. Its SI unit is Watt.