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//Variable Declaration
M = 0.040 //Molecualar wt of Argon, kh/mol
P = 101325.0 //Pressure and Temperature, Pa, K
T = 298.0
sigm = 3.6e-19 //
R = 8.314 //Molar Gas constant, mol^-1 K^-1
N_A = 6.02214129e+23 //mol^-1
//Calculations
DAr = (1./3)*sqrt(8*R*T/(%pi*M))*(R*T/(P*N_A*sqrt(2)*sigm))
//Results
printf("\n Diffusion coefficient of Argon %3.1e m2/s",DAr)
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