The pathogenesis of ectopic gastric mucosa is a matter of debate between a congenital-embryological-and an acquired origin-consecutive to a gastroesophageal reflux (GER) like Barrett's esophagus -, the most commonly accepted theory being that these areas are embryological remnants.
Standard size latex filled helium balloons stay afloat for approx 8 - 12 hours, metallic helium filled balloons float for 2-5 days. I have found that a 36 latex helium filled balloon can stay afloat for a number of days due to the thickness of the balloon and the massive quantity of helium.
Asked by: Watching them fly off up into the sky, there seems no limit to how high a helium balloon can go. In reality, there are two major constraints: the strength of the balloon material, and Archimedesâs principle. As a balloon ascends, the pressure of the surrounding air drops while the helium inside expands.Toy balloons burst at around 10km, while professional meteorological balloons reach heights of 30km.s a balloon ascends, the pressure of the surrounding air drops while the helium inside expands. Toy balloons burst at around 10km, while professional meteorological balloons reach heights of 30km.