Re: Technology related anachronisms on TV and in films etc.
My understanding from when I was a First Aider is that the small proportion of Carbon Dioxide that is present in atmospheric air is a factor in the breathing reflex. Ambulances carry a bottle of CO2 as part of their kit that can be added to Oxygen where a patient has difficulty in breathing. I well recall from the numerous brewery trips that we had at college that if you leaned over a fermentation vat and sniffed ( as we were sometimes encouraged to do - carefully), the high CO2 concentration would make you breathe in sharply.
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