t10[OC]=    60    55-70 oc
t90[OC]=   160    130-190 oC
d15/15=    0.78   715-780 kg/m3= 0,715-0,780 kg/m3
t10[oF]=1,8*t10[oC]+32     140
t90[oF]=1,8*t90[oC]+32     320
oAPI=141,5/d15/15-131,5   49.91
Log t10[oF]                2.15
log t90[oF]                2.51
log oAPI                   1.70
OB=1020,7-75,89*(4*LOGoAPI+LOGt10[oF]+1,3*LOG[oF])
                         95
D=ρ=   810   810-860 kg/m2        Dn=D-850              -40
t10=   185         185-195        t10N=t10-215    -30
t50=   270         230-270        T50n=t50-260    10
t90=   280         280-370        t90n=t90-310    -30
             B=E^(-0,0035*DN)-1          0.1503
Ci=45,2+0,0892*T10n+(0,131+0,901*B)*T50n+(0,0523-0,42*B)*t90N+0,00049*(t10N^2-t90N^2)+107*B+60*B^2
                                   71
^2)+107*B+60*B^2