Ordinary (Regular) vs Partial Derivative

So I want to briefly talk about the difference between ordinary derivative and partial derivative. So this really, both are possible in real life. The only thing different is the independent variable about this. Let's say velocity, it’s a function. If the velocity is only a function of t, then I can go ahead and use the ordinary derivative. However, if the velocity is a function of t, let's say pressure and elevation I'm at, when I am taking the partial, I acknowledge the fact that this P and h will not be a function of t. Okay, so I'm keeping these two constant and I'm taking the partial with respect to t. Let me give you an example. Let's say the velocity is, I'm making it up, 0.1 t square plus 5P plus, I don’t know, 17h. So if I'm taking del V del t, as we just discussed, I acknowledge the fact that this P is not a function of t, h is not a function of t. So this goes away, and I got myself 0.1 times 2t, right? Derivative of time square is 2t, will be 0.2t.