Notes%2009.15.10

# Notes%2009.15.10 - PROPERTIES INTRODUCTION We have...

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1 PROPERTIES - INTRODUCTION We have discussed extensive properties such as U, m, and V (for volume) which depend on the size or extent of a system, and Intensive properties such as u, v, T, and P which are independent of system extent (engineers are ambivalent about nomenclature for pressure, sometimes using p and P interchangeably)

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Important questions... How many properties are needed to define the state of a system? How do we obtain those properties? 2
Pure Pure means “…of uniform and invariable chemical composition (but more than one molecular type is allowed).” This allows a single phase of air to be a pure substance. All our substances will be pure. We will drop the use of the word. When we refer to a simple system we mean one filled with a pure substance--a simple, pure system. 3

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For a simple, pure substance y 1 = f(y 2 ,y 3 ), or p = p(v,T), v = v(p,T) and T = T(p,v) What do these equations define, in space?
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