linear interpolation

[rcd111]

linear interpolation is something i have never been very good at it and now i am having to use it again to figure out pressures and temperatures in a data book.

if t1 = 200 degrees and t2 = 300
p1 = 5 bar and p2 = 7 bar

how would i find the pressure at 214 degrees?

any help would be most useful

cheers

[zaza]

If this is a linear relationship, then the pressure moves proportionately between its lower and upper limits as the temperature does.

Consequently, 214 has the same proportionate position between 200 and 300 as your pressure P does between 5 and 7.

i.e. you are 14/100 'ths of the way between 200 and 300, therefore must be 14/100 'ths of the way between 5 and 7.

Capiche?



zaza