Carbon dioxide doesn't just displace oxygen; it is also toxic in itself. 

You cannot see carbon dioxide in its gaseous form.  What you see in a cloud is droplets of liquid.  The gas that then evaporates off them is invisible.  This is similar to the 'steam' you see from a kettle, which is not gaseeous water but water droplets; water vapour (the gaseous form of water) is likewise invisible.

It is possible to measure carbon dioxide levels (and indeed oxygen levels) in the air and to have an alarm linked to the measurement to trigger evacuation before a dangerous level is reached.

I don't quite understand what is the process that you are doing and how it relates to the carbon dioxide transfer.

Kate, to be honest, I am completely puzzled as the orginal post setting out the question which you answered seems to have been deleted so it's not clear what Paul's question was.

Paul, that said, I think if you have been asked to respond to a question in advance of an interview, the interviewers probably want you to do some homework and not just parrot what people might offer up on a chat forum.

Further, if the interviewers have any competence, then they should be able to easily root out any hint of plagiarism via some secondary questions to let you explain how you have come to your thinking.

Of course, there is nothing wrong with doing some networking and perhaps your original thread showed that you HAD been thinking about the answer for yourself. But, deletion of your initial posting makes it look like something rather different had been put up for others to answer.

Originally Posted by: Westwick27925

It's an interview scenario My details are paul.westwick@dhl.com

Well that attempted quote didn't work.

We do have Private Messaging on the forum so you don;t need to disclose an employer email address.