Scalar vs Vector

Let's talk about the difference between a scalar and a vector. It's fairly fundamental. But the scalar is only has a magnitude; it doesn't have a direction. But the vector also has a magnitude but also has a direction, right? So, this is the biggest difference between the two. If you look at the thermodynamics or fluid mechanics, you can see that we are using temperature and pressure all over the place, right? So, those are scalars, and I'll explain in one second. In terms of the vectors, I have forces—quite common for us, right? And you can see what I did: I put an arrow on top of it to indicate it's a vector. And this is a velocity vector, right? So, if you look at, for instance, the temperature right now—it's 72°F right over here, right? Does it have components in the X direction, Y direction, whatever? No, not really. So, these don't have any components in a particular direction—the scalars. On the other hand, vectors do.