H2 Gas: Stability and Reactivity on Earth's Surface

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Hydrogen gas has a high reactivity, particularly with oxygen, leading to explosive mixtures when combined in the right proportions. Rockets utilize liquid hydrogen for propulsion, demonstrating its explosive potential. Approximately 2% hydrogen in air can create an explosive atmosphere, although this mixture is likely to be short-lived in the atmosphere. In contrast, methane has a significantly longer atmospheric half-life, lasting several decades, highlighting differences in stability and reactivity between these gases.
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If it didn't escape to space so easily, then would it easily react with other things on Earth's surface?
 
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Yes.
 
Hydrogen gas + oxygen gas = boom

See rockets for examples. They usually use liquid h2, but its the same principle
 
You need about 2% hydrogen in air to form an explosive mixture but it would probably be relatively short lived in the atmosphere. Compare with methane for example. I have a vague recollection that it has a half life of some decades in the atmosphere.
 

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