What kind of analysis you are doing??
If you are analysing heat transfer problem, element normals are useful in defining the optical properties like emissivity
Density is mass per unit volume,
Let me take two gases of unit volume, having different densities,
The gas which has less density has less mass,
The gas which has more density has more mass,
when these gas molecules hit the wall, because of change in momentum pressure will be...
Hello friends,
Every object has certain color, because it reflects that potion of light & absorbs all other visible radiation,
What is the mechanism that happens on the surface of a body, which makes it reflect certain portion & absorb rest portion.
Thanks for the reply,
I understand that certain coatings have high solar absorptivity & low IR emissivity, my question is are there any surfaces or coatings which have high IR emissivity & low IR absorptivity.