Link to home
Start Free TrialLog in
Avatar of WTC_Services
WTC_Services

asked on

Find Chart Equation from Graphic

Hi,

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

thanks,
wtc


pressure-in-transformer.jpg
ASKER CERTIFIED SOLUTION
Avatar of hintco
hintco
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Avatar of TommySzalapski
TommySzalapski
Flag of United States of America image
The x axis is logarithmic.
Avatar of byundt
byundt
Flag of United States of America image
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