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AS bio help!!

There is a question on spirometer and shows a trace. Its asking to work out the difference in volume between a certain time. ( x axis showing time), would I have to measure from the top of the first trough or the bottom? ps, the time where it stops the trace is going down.
Sorry you've not had any responses about this. :frown:

Why not try posting in a specific subject forum- you might have more luck there.

Here's a link to our subject forum which should help get you more responses. :redface:

:h:

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