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+//Variable declaration:
+Ts = 110.0+273.0                //Surface temperature of plate (K)
+Too = 30.0+273.0                //Ambient air temperature (K)
+L = 3.5                         //Height of plate (m)
+g = 9.807                       //Gravitational acceleration (m^2/s)
+
+//Calculation:
+Tf = (Ts+Too)/2                 //Film temperature (K)
+DT = Ts - Too                   //Temperature difference between surface and air (K)
+//From appendix:
+v = 2.0*10**-5                  //Kinematic viscosity for air (m^2/s)
+k = 0.029                       //Thermal conductivity for air (W/m.K)
+Pr = 0.7                        //Prandtl number
+B = 1.0/Tf                      //Coefficient of expansion (K^-1)
+Gr = g*B*DT*L**3/v**2           //Grashof number
+Ra = Gr*Pr                      //Rayleigh number
+
+//Result:
+printf("The Grashof number is : %.2f  x 10^11 .",Gr/10**11)
+printf("The Rayleigh number is : %.2f  x 10^11 .",Ra/10**11)