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+// Example 3// Ch 3
+clc;
+clear;
+close;
+// given data
+R=8314; // gas constant in J/kg.mol.K
+T=300; // temperature 27 deg C, 27+293=300K
+me=0.10; //mean free path in meters
+rm=1.7*10^-10 //molecular radius in angstrom
+M=28 //im mole^-1
+m0=4.8*10^-26 //mass of nitrogen molecule
+N = 1/[4*%pi*((rm)^2)*me]; // no. of molecules in gas
+printf("no. of molecules %e",N)
+p = [(N*m0)/M]*R*T; // max pressure in chamber in N/m2
+printf("max pressure in chamber %f N/m2",p) 
+// Note: Calculation in the book is wrong So answer in the book is wrong