# Tag Info

### What regulates the size of our atmosphere?

The Karman line of 100 km, as you might guess, is a fairly arbitrary legal definition rather than one based in physics or meteorology. But it is roughly the altitude where a plane would have to ...
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### What regulates the size of our atmosphere?

Yes, we are just lucky! And not just about the amount of air, but about nearly everything that has made this little blue planet able to sustain life.
• 100

### Atmospheric pressure and gas pressure

You premise is wrong. The air inside the inverted jar is not at atmospheric pressure. It is well below atmospheric pressure. The water is acting as a piston which is pulling down with a force of mg. ...
• 100

### Nocturnal freezing of water: Calculation of radiation through atmosphere?

With the air being very still and clear sky, the ground can radiate more heat than any possible absorption from the atmosphere above. The atmosphere up higher even in an inversion where it's warmer, ...

### Why does atmospheric drag speed up satellites?

Here's a rough mathematical description: Imagine a small body of mass $m$ orbiting at a speed $v$ around a large body of mass $M$. The radius of the circular (frictionless) orbit is given by equating ...

### Why does atmospheric drag speed up satellites?

My theory is that the work done by the drag force is insignificant in comparison to the whole energy of the orbiter...it essentially pushes it to a lower orbit while mostly conserving the total energy....
• 39k
1 vote

### Surely $\rm CO_2$ reflects incoming solar infrared radiation?

Is the greenhouse effect not cancelled out by the $\rm CO_2$ in the atmosphere reflecting solar infrared radiation back into space? No. The idea that the greenhouse effect is caused and controlled by ...
### Surely $\rm CO_2$ reflects incoming solar infrared radiation?
Most of the incoming solar radiation is in the visible, where CO$_2$ is transparent. The radiation is absorbed by the ground and warms it. The ground radiates in the infrared. Without CO$_2$, the ...