Find Chart Equation from Graphic


I'm trying to find an equation for this chart, to determine the "Pressure in Transformer"


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you can do this by excel 2010 throw these steps:
1- Put the x, y values in two columns.
2- Select them and draw the chart.
3- Add Trend Line in the chart.
4- And then choose the choice display the equation.
For more details please watch this youtube video

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The x axis is logarithmic.
byundtMechanical EngineerCommented:
hintco's suggestion will definitely work. Make sure that temperature is entered as the X-axis data and log(pressure) as the Y-axis. There is a some curvature on the semi-log plot, so a second order polynomial would be a better fit than linear.
log(pressure) = a + bT + cT^2
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Microsoft Excel

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