Pharaoh definition, meaning, English dictionary, synonym, see also 'Pharaoh ant',Pharaoh's ant',Pharaoh ant',Pharos', Reverso dictionary, English definition, English vocabulary Translation Context
The intake to this ventilation. system must be near the floor. (Chlorine as a gas is. 2.5 times heavier than air.) Exhaust Rate The exhaust system must be able to exchange the air. in the room every three to four minutes.
Quick Answer. Any gas that is heavier than air, such as xenon or sulphur hexaflouride, makes the human voice sound deep. The reason why helium gas makes voices sound high is that it is lighter than air and because sound travels faster through it than in air. Continue Reading.