Have you told Mr Trump we are all going to die down here?

You are trolling yes?

 

Pfff, look up the ideal gas laws, thermal expansion, how an hot air balloon works. If you do not believe air expands when heated please feel free to experiment on an aerosol of air by adding heat to the can.

 

What will replace the warm air that rises?

 

More trolling
Ever heard the sentence

Nature abhors a vacuum?

 

The pressure rises at constant volume.

 

''The “thin” air at high altitudes has considerably less oxygen and pressure. This is because the earth's gravity holds the oxygen close to the surface — so much so that half of the oxygen in the atmosphere is found below 18,000 feet. For comparison, Mount Everest is about 29,000 feet.26 Feb 2015''

Try looking things up before you go accusing and then perhaps you can stay off my ignore list. I don't need to speak to you.

 

The air pressure at altitude is low because the air is spread out more, there is more energy at altitude than nearer the earths surface.

 

Sorry but it is not only the oxygen that is "held close to the surface"

If you theory about thinning of the atmosphere were true then how come deserts are not vacuums?

 

Really? Then why is it colder?

 

The deserts are simply not hot enough at the moment to have no air, but I ''bet'' the air at the desert is thinner than a colder climate?

 

Density function, less permeability.

 

Here's a rough diagram



You have to account for though that the inverse square law is a section of an isotropic process , i.e an expanding sphere.

 

Anyway you are probably confused now, when science eventually understand that gravity is cold fusion you might get it.

 

Tell you what how about we put some real money on that? Loser to pay the forum a donation $20

 

I put bet in '''', I wouldn't of bet any value on it.. Anyway I have looked it up since and although it seems pretty contradictory to the ideal gas laws, you are seemingly correct and the air distribution over the planet is quite constant. However this does not disprove that if the climate became to hot there would be no air at ground level. I explain the constant because the cold air can still fall at this time, but there would still be an eventuality of no air at ground level if equilibrium was surpassed.

 

OP is a joke, right? JIC... air only 'rises' when heated because cooler air is heavier (denser). If *all* the air is heated and there is no cooler air to push the hotter air up, the air will stay where it is. Being held down by gravity such as it is, it wouldnt likely even expand quite as much. We would still be able to breath, it just might take us a few months before we could run marathons as our bodies aclimate to the *slightly* less dense air.

The air would have to get a lot hotter than we could survive breathing to get thin enough that we would asphixiate. We would cook first.

 

Suggest you read this

https://en.m.wikipedia.org/wiki/Runaway_greenhouse_effect

Venus still has an atmosphere

 

The part where most of the data points are assumed and not actual like in the ocean temperature studies.

 

I hope it wasn't serious, because I've been treating it as a joke.

 

I think it was serious. I mean, I don't think the OP is thinking the entire air mass lifts up off the surface to form a vacuum (which by the way isn't possible). But, the OP does say air will spread out when it gets hot. And he's absolutely right about that. The problem is, and I ran the numbers, to thin the air out enough to reduce the number of oxygen molecules in a control volume by say 30% (about the amount at which you'd begin to notice) you'd have to heat the lowest 2000 meters or so of air by an amount that would make temperature more of problem long before the lack of oxygen is. So modernpaladin is right, we'll cook before we asphyxiate.