Originally Posted by forcemasteryoda
cold air is more dense, thus is heaver per volume, and thus is more affected by gravity. the cold air falls, displacing the hot air in order to make it appear as if it is rising, but in reality, hot air cannot rise without cold air, if all the air is hot, none of it will rise.
Okay I have 2 ways to prove you wrong:
1. What is hot and what is cold? The are relative measurements. I.E., in my house, 60 degrees F is quite cold. However, in the Large Hadron Particle accelerator, 60 degrees F is quite hot! Therefore, there is only really "hot" and and "cold" air if there is some difference temperature between all the air in your analysis. In other words, hot air tends to rise above cold air.
2. hot air is less dense, thus is lighter per volume, and thus is less affected by gravity. the hot air rises, displacing the cold air in order to make it appear as if it is sinking, but in reality, cold air cannot sink without hot air, if all the air is cold, none of it will sink.
Furthermore, I must correct you as you stated that "less dense air is less affected by gravity". The equations of gravity, whether Newtonian or Relative, have no dependency on the density of the mass in which you are examining. The "rising" of a less dense substance can be more correctly be described by the hydrostatic force on the less dense air by the more dense air.... In other words, the less dense air has less pressure (you know, density*gravity*height).