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.
show more Standard temperature and pressure (STP) are considered to be 298 K and 1.0 atm. Predict which of the following changes will cause the volume of the balloon to increase or decrease assuming that the temperature and the gas filling the balloon remain unchanged.balloon filled with helium at STP is submerged nder water where the pressure is 1.25 atm. --balloon filled with helim at STP floats into the atmosphere where the pressure is 0.5 atm. --balloon filled with helium at STP floats into air where the pressure equals 1 atm.