how to find the area under a graph

i need help in finding the area under the graph in excel as it is a complicated curve for the pressure vs volume of a combustion chamber

How does your curve look like please?

"chogga" wrote:

>
> i need help in finding the area under the graph in excel as it is a
> complicated curve for the pressure vs volume of a combustion chamber
>
>
> --
> chogga
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See
http://www.stfx.ca/people/bliengme/E...UnderCurve.htm
for a couple of simple approaches to numerical integration.

If you know the formula for the curve, you might try integrating it
analytically. Similarly, you could integrate a polynomial (or other)
approximation to the curve.

Jerry

chogga wrote:

> i need help in finding the area under the graph in excel as it is a
> complicated curve for the pressure vs volume of a combustion chamber