//Diameter of chimney(in m):
D=1;
//Height of chimney(in m):
L=25;
//Speed of wind(in kmph):
s=50;
//Density of air(in kg/m^3):
d=1.23;
//Viscosity of air(in kg/(m-s)):
u=1.79*10^-5;
//Pressure(in kPa):
p=101;