// A Textbook of Fluid Mecahnics and Hydraulic Machines - By R K Bansal
// Chapter 1-Properties of Fluid
// Problem 1.26

//Given Data Set in the Problem(SI Units)
d=40*10^-3
p=2.5


//Calculations 
//Using Pressure =8*Surface tension/diameter of the soap bubble
st=p*d/8
mprintf("The Surface tension inside the soap bubble is %f N/m",st)