The particle density in you is much greater than the particle density in the atmosphere.the thing that still gets me about it is if heat and light are gathered in the interior of the atmosphere, than how come i can block heat and light just by standing in the shade (immediately cooler and darker. If the heat and light were all distributed under the atmosphere than there should be no shadows when someone or something stands in between the sun and the ground. I hope I worded that well enough and expressed my views clearly enough.