Tom Mattson said:
A flux is a measure of the flow of a vector field through a given surface or region. It represents the amount of the field that passes through the surface per unit time.
A vector field is a mathematical concept that describes a quantity, such as velocity or force, that varies in space. It is represented by a vector at each point in space.
Flux is calculated by taking the dot product of the vector field and the normal vector to the surface, and then integrating over the surface. This gives the total amount of the vector field that is passing through the surface.
The flux of a vector field is important because it provides information about the flow of the field through a given region. This can be helpful in understanding physical phenomena and making predictions about future behavior.
Finding the flux out of a cube means calculating the amount of the vector field that is passing through the six faces of the cube. This can be useful in applications such as fluid dynamics or electromagnetism.