Example 9.1-1 Measurement of Thermal Conductivity
      _____
   T0|  ^  |T1
Q--->|  |  |--->Q
     |  A  |
     |  |  |
     |__|__|
      <-Y->
>  restart;
>  A:=1*ft^2; Y:=0.252*inch; Q:=3*watt; T0:=24*C; T1:=26*C; Given data
>  k:=Q*Y/(A*(T1-T0));  Eq 9.1-1
>  watt:=J/sec; ft:=12*inch; inch:=2.54*cm; J:=.23901*cal; C:=K;  Converting units.
>  k;  The text found 2.47e-4 cal/(sec*cm*K)