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So, welcome to this lecture 5 of our course on Fundamentals of Transport Processes, Dewar going through integral and differential calculus with vectors in order to set the stage for deriving conservation equations for the fluid velocity field, which itself is a vector. As I said we are doing some preparatory courses in order to familiarize ourselves with how one can do calculus integral and differential, considering vectors as objects in themselves rather than trying to do them for the individual components. So, our starting point vector calculus in this one dimension, I had defined for you what is meant by the derivative of a function and what is meant by the integral. So, if I have a single valued function y of x, single valued means that at each value of x there is a unique value of y, if I want to define the derivative at a point. I take a small integral delta x around this point and find out what is the variation in y; when travel with a small integral delta x, that is delta y. In the limit as delta x goes to0 delta y will also go to 0, but the ratio need not and the limit as delta equals to 0, the ratio is what is called the derivative of the functional that particular location. So, limit as delta x goes to 0 of delta y b delta x is equal to d y by d x alternatively delta times the derivative, the interval times the derivative gives, you are the difference in the different function y. An integral form of this is that integral between 2 end points of d times the derivative is the difference in y between those 2 end points. So, we use this analogy to defined of first derivative function, that is the gradient grad T, it is defined such that delta t that is if Sitting at one particular location x and I move a small distance delta x to a new location. The change in temperature say between these 2, the final minus the initial point is equal to this gradient of T dotted with the displacement gradient of T dotted with the vector displacement that was moved. So, the gradient of T tells, you how the temperatures varying is changing locally as you move some distance around, this point. So, even though the gradient I had defined interns of the partial derivatives grad T was equal to partial T by partial x 1 e 1 plus partial T by x 2 e 2 plus partial T by partial 3 times e 3. So, even though grad T was defined in terms of these partial derivatives, the gradient vector itself has a direction in the magnitude that is independent of the coordinate system, when I am using to analyze, the problem. ITIS a well-defined, because if I go pheromone location to the next location, the difference in temperature has to be grad T times Delta, regardless of what coordinate system, I used to represent grad T and delta x, the result, that I get has to be exactly the same independent of coordinate system. So, grad T is a vector, which is independent of the underlying coordinate system, it has magnitude, which is independent of underlying coordinate system. That means the...
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