Area Vector
4 mins read

Area Vector

Ohh! Finally you are here and that means you are interested in knowing about area vector! So the question arises, ” Is area a vector?” and the answer is no, of course not. Actually area is a physical quantity that don’t have properties of vector, so it is scalar.

“ The conclusion is area is a scalar. “

Truth of Area Vector

So now another question comes into role…if area is scalar why are we here….here discussing about area vector. And the answer is simple. In Physics there are many situations where treating area as vector simplifies mathematical formulations and calculations. Note the word I am using here ‘treating’ i.e. area is still a scalar and not vector. We are only associating a hypothetical vector with area for mathematical ease. And that’s it.

Disclosing the Facts

So, now let’s try to understand the facts and assumptions regarding this ( area vector – though I don’t like to say it vector ) vector. Area is always associated with some surface. Surface can be open or closed. Depending on this there are two scenarios, but before going too far let’s consider a general assumption-

The Assumption We Made

While thinking of a vector we think of two things – very first one is magnitude and second but most important one is direction ( If you don’t know about vectors, I would recommend reading my article named The Vectors ). So let’s consider these two aspects. The magnitude of area vector is always ( in both of the scenarios ) taken to be equal to area of the surface. But while determining direction we need to be extra careful. This is the case where two scenarios ( open surface and closed surface ) varies. So let’s discuss it under two headings –

Vector Related to Area For

Open Surface :

While assuming area vector for open surface, the direction is always chosen to be normal to the surface. When you actually go to draw a normal to any surface you will notice there are two possibilities for drawing normal. It could be inwards or outwards. And you are free to chose any of these two directions as the direction of area vector.

 Closed Surface :

Unlike in the case of open surface, The direction of area vector is always chosen outwards, and this is convention. So we are not free while choosing direction for area vector in case of closed surface.

Significance in Physics

In physics, the area vector finds extensive use in the study of electromagnetic fields. It helps define the direction of the magnetic field around a current-carrying wire and plays a crucial role in Faraday’s law of electromagnetic induction. The area vector’s involvement in Gauss’s law aids in understanding the distribution of electric charges and fields. Moreover, in fluid dynamics, it assists in analyzing the flow of fluids across surfaces, facilitating the study of fluid behavior and forces.


In conclusion, the area vector stands as a versatile and indispensable concept across a spectrum of scientific and engineering domains. Its ability to quantify surface orientation, coupled with its role in defining physical interactions, underscores its significance. Whether in the realm of physics, engineering, or mathematics, the area vector empowers researchers, scientists, and engineers to gain deeper insights into the natural world and create innovative solutions.

Final Words

As we wrap up our exploration of the area vector, it becomes evident that its applications are boundless, and its implications profound. By grasping the essence of the area vector, we unlock a gateway to unraveling complex phenomena and harnessing its power to drive advancements that shape our understanding of the universe and the technologies that drive our modern world.

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