I am doing phase equilibria in college and I don't have very good books (I am in the first semester and I haven't got the chance to get good books yet) to study from and neither am I being able to find any websites that will explain to me the basic concepts of the chapter(wikipedia goes straight on to the details without a good explain on the basics). Please help me out by explaining these problems that I have and if possible suggest a good website where I can get good reading material. 1. Is a mixture of different phases always heterogeneous? 2.Are the components of a system the same as the phases comprising the system? 3.Why do we say that the degrees of freedom of a system is the measure of the minimum number of independant variables defining the system and not the maximum? 4. Is the degree of freedom of a system comprising 3 phases always one? How do we detremine the degree of freedom of a system by looking at it? Please help me out.Thanks in advance.