Thermal properties of air

 

The following commands are used to evaluate the thermal conductivity of air at 300 K:

 

load Air.dat   % required once prior to property function call

prop("k",Air,300)     % returns thermal conductivity of air at 300K

ans =  0.026240

 

Notice that the property table 'Air.dat' must be loaded (once) prior to calling a property function. To determine the density of air at both 350 K and 450 K:

 

prop("den",Air,[350, 450])

ans =

   1.00900   0.78440

 

The temperature dependence of both density and thermal conductivity of air can be displayed with the commands:

 

T=linspace(300,900,100);         % create an array of temperatures

plotyy(T,prop("den",Air,T),T,prop("k",Air,T)); % plot den(T) and k(T)