Zippo lighter dating code chart

Ever since NASA has avoided using pure oxygen atmosphere wherever possible, which means using high-pressure.

The problem is if you go from a high-pressure environment (like a habitat module) into a low-pressure environment (like a low-pressure space suit) you run the risk of the bends.

It would be the outer-space equivalent of those stubborn elderly hospital patients who insist on smoking cigarettes while wearing oxygen tanks. NASA tolerates low-pressure pure-oxygen pressurization in their soft space suits because they have no choice.

Suits can be Soft, Hard-shell, Semi-Rigid/Hybrid or Skintight. This means they cannot be pressurized to the same level as the inside of the habitat module or the space suited person will be forced into a posture like a star-fish and be unable to bend any joints.NASA astronaut always put on a transdermal dimenhydrinate anti-nausea patch when suiting up in a space suit, in case of drop sickness.The chances of that are slight, but suffocating inside a helmet full of vomit is a nasty way to die.The accuracy of space suits in science fiction was very much hit or miss.The low budget show Space Academy had "Life Support Bracelets" and the Star Trek Animated series had force-field based "Life Support Belts" as a cheapskate way to avoid the special effect expense of renting or drawing an actual space suit.

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Lower pressure means the suit uses pure oxygen unlike the habitat module.

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