Some Biblical literalists believe that {{cquote|... before the [[Flood]], there was a "firmament", or vapor canopy, separating the waters of the [[heaven]]s from the waters of the [[earth]]. Because all that water was pressing down on the Earth's atmosphere, the air pressure in Biblical times would have been several times greater than it is today. Some [[creation scientist]]s credit the longevity of the [[patriarch]]s to the greatly increased air pressure — much as an [[astronaut]] living in a pressurized [[space station]] ages more slowly than his twin at home.}} There are a few problems with this: There is no scientifically plausible mechanism that would cause the much denser water to lie above the air. There is no evidence suggesting that greater air pressure increases longevity. The pressure inside a spacecraft is not higher than normal. Also, the phrase "ages more slowly than his twin at home" suggests a confusion with the "[[Theory_of_relativity#The_Twin_Paradox|Twin Paradox]]" of relativity. The relativistic age difference is about 10 milliseconds per month.
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Some Biblical literalists believe that {{cquote|... before the [[Flood]], there was a "firmament", or vapor canopy, separating the waters of the [[heaven]]s from the waters of the [[earth]]. Because all that water was pressing down on the Earth's atmosphere, the air pressure in Biblical times would have been several times greater than it is today. Some [[creation scientist]]s credit the longevity of the [[patriarch]]s to the greatly increased air pressure — much as an [[astronaut]] living in a pressurized [[space station]] ages more slowly than his twin at home.}} There are a few problems with this: There is no scientifically plausible mechanism that would cause the much denser water to lie above the air. There is no evidence suggesting that greater air pressure increases longevity. The pressure inside a spacecraft is not higher than normal. Also, the phrase "ages more slowly than his twin at home" suggests a confusion with the "[[Theory of relativity#The Twin Paradox|Twin Paradox]]" of relativity. The relativistic age difference is about 10 milliseconds per month.