1 Single breath of 100% O2. 2  During the following expiration, [N2] increases from 0% (pure dead space gas) to equilibrium (pure alveolar gas) (i.e. plateau). 3  Using [N2] vs. 4  graph, anatomical dead space is taken to be at the mid-point of the transition from conducting zone to gas exchange zone.
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A 20V Max DeWalt DCF895 impact driver was used for all the testing, and it was set to its highest impact/speed setting. My fastener of choice was the 1-5/8â³ Grip Rite drywall screw, because they are both widely used and easily available. Bits were chosen that are easily available in retail outlets across the country.