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+//Example 19// Ch 3
+clc;
+clear;
+close;
+// given data
+a = 9003;//constant in m-1kPa-1
+B = 256584;//in V/m.kPa
+p = 0.5;//in kPa
+M = 1/(a*p);//mean free path in meters
+printf("mean free path of electron in nitrogen %e m",M)
+Vi = B/a; //ionization potential of nitrogen
+printf("ionization potential of nitrogen %f V",Vi)