physical chemistry - the branch of chemistry dealing with the physical properties of chemical substances
change - undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"
physical chemistry - the branch of chemistry dealing with the physical properties of chemical substances
change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"
The detection of ionised oxygen indicates that many very brilliant stars, several dozen times more massive than the Sun, have formed in the galaxy and are emitting the intense ultraviolet light needed to ionise the oxygen atoms.
But when the first objects began to shine, a few hundred million years after the Big Bang, they emitted powerful radiation that started to break up those neutral atoms -- to ionise the gas.
A jet of ionised air is injected into the bottle or can to ionise the inner surface, releasing contamination, which simply falls out of the inverted container.