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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Most Popular. 1  The cordless drill/driver is by far the most popular portable power tool of all time, and it's not going to lose that title anytime soon. However, cordless drills are beginning to lose ground to a relatively new type of cordless tool, the impact driver.