Thermal inversion

So i have to do a power point presentation on thermal inversion for my enviromental science (i'm not a hippy) class. I've got it pretty sussed apart from one thing, what makes the hot air stay put over the cold air in a thermal inversion scenario? Howcome the hot air just doesn't drift away? Is it because there's another layer of cold air abover the warm air creating a sandwich effect? I turn to anon because google and wikishit have both failed me on this one detail.

Hot air has a lower density for the same pressure so it floats on the cold air. It doesn't drift away because of gravity.

Yeah, that's pretty much it. The sexually excited molecules begin to agitate and rub up against one another and eventually the weight of the air begins to lessen as they have the potential to seperate from themselves, sort of like water into vapor scenario. Why is the cold air on top though? Space is a vacuum where heating radiation has limited sustainability within. So, when hot air rises, it meets up with it's lover the cold air and begins to agitate and rub up against that, but the cold air doesn't like that so it rolls over and goes to sleep on the other side of the bed. Since the hot air reacts better to warm air like a sexually frustrated male, it will try and seek out other cool air to agitate and rub up against and the only cold air after that is the vacuum of space. Does this help any?

Essentially, the warm or hot air is trying to return to its natural state of being cool and the only way it can do this is through radiation of colder air via the vacuum of space. Think of it like a drug addict who finds there is no more drugs to get high on and goes ballistic looking for a dealer and when the addict finds the drugs and takes them, the addict settles down back to a suttle form. Is this getting a little too real-world for you. Think it's just hot air and cold air? Hehehehe.

fat people are isothermal