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SURFACE TENSION HELP

Allows the prediction of surface tension values for various organic compounds. It uses the Sugden equation and group contribution values.

Sugden Equation used :

@ = [[(Pch(Pl – Pv))/M)]^4 ]10^-12

@ = surface tension, mJ/m^2.

Pch = Sugden’s parachor.

Pl = liquid density, kg/m^3.

Pv = density of the saturated vapor, kg/m^3.

M = molecular weight.

Method of use :

From compound structure enter number of times each element exists in the compound. I.e. if C appears 6 times then enter 6 in the text box along side the C element. Once this is completed for each element/structure, enter liquid density, density of saturated vapor and molecular weight. Calcutions of Sugdens parachor value and surface tension occur on every user input/data change and displayed.

See example below:

surface tension screen

Calculations created and displayed with every number input/change.

Contributions of each group are :

C Contribution : 4.8

H Contribution : 17.1

H in (OH) Contribution : 11.3

O Contribution : 20.0

O2 Contribution : 60.0

N Contribution : 12.5

S Contribution : 48.2

P Contribution : 37.7

F Contribution : 25.7

Cl Contribution : 54.3

Br Contribution : 68.0

I Contribution : 91.0

Se Contribution : 62.5

Si Contribution : 25.0

Al Contribution : 38.6

Sn Contribution : 57.9

As Contribution : 50.1

Doble bond: terminal 2,3-position Contribution : 23.2

Doble bond: terminal 3,4-position Contribution : 23.2

Triple bond Contribution : 46.6

Rings 3-membered Contribution : 16.7

Rings 4-membered Contribution : 11.6

Rings 5-membered Contribution : 8.5

Rings 6-membered Contribution : 6.1