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This ullage or headspace area contains more oxygen and thus speeds atmospheric corrosion, as evidenced by the appearance of rust scales.
en.wikipedia.org The cold gas vernier engines are cross-fed by gas drawn from ullage space of the opposite tank.
en.wikipedia.org This is because the pressure of the air bubble that is the ullage space rises and falls depending on temperature fluctuation.
en.wikipedia.org Four pressure transducers located at the top of the liquid oxygen and liquid hydrogen tanks monitor the ullage pressures.
en.wikipedia.org There are standard descriptions used by wine merchants and auction houses for the fill levels (ullage levels) of wine.
en.wikipedia.org