Use of non independent variables.

Description
Example from Physics is discussed when three or more variables are dependent on each other e.g. pressure volume and temperature are non independent variables. To describe the change of a function of several variables, the partial derivative is introduced. Problems on partial differentiation are solved in this video tutorial.
Prof. Denis Auroux, Maths, Fall 2007,18.02 Multivariable Calculus: 14: Non-Independent Variables, Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed September 19,2011). License: Creative Commons BY-NC-SA:http://ocw.mit.edu/terms/#cc