There are times, however, when we are more interested in finding the function from which the potx

(A34) 2

c

P

nRT

P

dP

− nRT = + ∫

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There are times, however, when we are more interested in finding the function from which

the integrand came (i.e., finding the antiderivative) than in finding the actual change. Then we

must recognize that the derivative of a constant is zero, so any arbitrary constant added to the

integral vanishes in finding the integrand. Thus we may write

where c is an arbitrary, or unknown, constant. Such an expression is called an indefinite integral.