There's a more scientific way to explain it but heres a simple one; If you have a balloon filled with helium where does it want to go? Up because its lighter than air so earths gravity is having a lesser effect on it. SO if its not in the confines of the balloon it will keep going until it reaches the outer edges of the atmosphere, at this point it will slowly 'leak' off into space and it will do so first as its lighter than most other gases floating around in the upper atmosphere
No planet can hold any gas. Everything escapes, the only question is how fast.
Atmosphere is lost faster, when:
gas is lighter
temperature is higher,
gravity is lower,
planet has smaller size.
Potential energy of helium atom near the surface is
P = -mgRe = -μ/Na gRe
Exponential factor in Boltzmann distribution is
exp(-P/kT) = exp(μ/Na gRe / kT) = exp(μ/(RT) gRe)
Assuming T= 300 K we have
μ/RT gRe = 0.004/(8.3 300) 9.8 6,370,000 = 100
So once per exp(-100) ~ 10^-43 attempts at escaping helium atom manages to do so. Probabilty 10^-34 is very small, but it sharply depends on temperature. Throw in 1000K and you have p ~ 10^-13, which means rather quick escape.
Conclusion:
Planet Earth is unable to hold lighter gases, namely hydrogen H2, HD, D2, and helium He4 and He3. Heavier gases like nitrogen and oxygen are safe.
Helium is lower density than the air, thus rises by buoyancy. As it rises the air pressure outside decreases and the ballon expands from the pressue inside.
they've left because of their decomposition by ultra-violets rays
they dont escape due to earth's gravity
Yes
Payload weight
hi,this is because you leave the earths atmosphere and usaly from earth once you leave the earth in the atmosphere it gets very cold.this must happen from the opposite from the sun so its like this.
Payload weight
It's called evaporation.
By reacting with other substances or by being dissolved in water.
No
It is radiated by many of the gases in the lower atmosphere.
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In march 14 1968
sputnik
Payload weight
Stars are said to be off the main sequence when they stop fusing hydrogen into helium.
Payload weight
hi,this is because you leave the earths atmosphere and usaly from earth once you leave the earth in the atmosphere it gets very cold.this must happen from the opposite from the sun so its like this.
To reach the complete Exophere of the earth, it is usually said you will need to travel 10,00km vertically. Though its approximately 100km to leave earths oxygen rich atmosphere.
No. However, some water vapor in the upper atmosphere is split apart into hydrogen and oxygen by ultraviloet radiation. Some of this hydrogen leaves the atmosphere. This rate of loss is tiny, however.
If you travel some 12. 5 miles into the sky, you will leave roughly 99 percent of the atmosphere behind. At 30 miles up, the density of the atmosphere is roughly one million times less than at the surface.