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+clc();

+clear;

+// To estimate the time lag of temperature (sine) wave 

+t = 24;                        // Time period of tempearture wave in hr

+k = 0.6;                       // Thermal conductivity of wall in Btu/hr-ft-degF

+Cp = 0.2;                      // Specific heat capacity of wall in Btu/lb-degF

+y = 110;                       // specific gravity in lb/ft^3

+x = 8/12;                      // Distance from surface in ft

+a = k/(y*Cp);                   // Thermal diffusivity in ft^2/hr

+n=1/t;                         // frequency in /hr

+delr = x/(2*sqrt(a*%pi*n);     // Time lag in hr

+printf("Time lag of the temperature at a point 8 in from surface is %.1f hr", delr;