1. 0C kN/m2
220
310

2. [ ( ) ( ) ( ) + + ( ) + + ] (f (xo)) etc. A) What is pressure at 75 oC
Use Newton’s forward difference
formula and extrapolate. 1 2 3 m m m [ ( ) ( ) ( )
Emf(xo) =
1 + + + 1 2 3 4 m ( ) + +
etc. ]
(f (xo)) 4
Always try to use smallest value of m with largest number of difference values

3. ] (f (xo)) For pressure determination 75 oC
we can use 3 difference values if
45 oC is selected as the xo reference
( oC, kN/m2, 2 1 3 , )
(45 , , 240, 30, ) o 1 2
P75 = [ 1 + (6/1)
+ (6x5/2x1) 3 ]
(f (xo))
+ (120/6)

4. P75 = [ 1 + (6/1)(240) + (15)(30)
+ (30x4/6)(10) ]
(1790)
P75 =
( oC, kN/m2, 2 1 3 , )
(75 , , 240, 30, )