This is a prototypical output of a '<a href="https://en.wikipedia.org/wiki/spirometer" class="extiw" title="en:spirometer">en:spirometer</a>'. The vertical axis signifies the <a href="https://en.wikipedia.org/wiki/volume" class="extiw" title="en:volume">en:volume</a> and the horizontal axis signifies <a href="https://en.wikipedia.org/wiki/time" class="extiw" title="en:time">en:time</a>. The bottom left corner equals zero lung volume at the start of the spirometer recording session. The first small <a href="https://en.wikipedia.org/wiki/amplitude" class="extiw" title="en:amplitude">en:amplitude</a> part of the <a href="https://en.wikipedia.org/wiki/sinusoid" class="extiw" title="en:sinusoid">en:sinusoid</a> depicts repeated resting state involuntary breathing. The amplitude of this small sinusoid corresponds to the 'Tidal Volume'. The large positive amplitude spike represents voluntary inspiration to maximal volume or 'Total Lung Volume'. The large negative amplitude spike represents forced expiration to the lowest possible <a href="https://en.wikipedia.org/wiki/physiological" class="extiw" title="en:physiological">en:physiological</a> lung volume called 'Residual Volume'.
<p>All of the <a href="https://en.wikipedia.org/wiki/lung_volumes" class="extiw" title="en:lung volumes">en:lung volumes</a> commonly referred to in the literature are labeled.
</p><p><a href="https://en.wikipedia.org/wiki/User:Vihsadas" class="extiw" title="en:User:Vihsadas">Vihsadas</a> 21:31, 18 April 2007 (UTC)
<a href="https://en.wikipedia.org/wiki/User:Vihsadas" class="extiw" title="en:User:Vihsadas">Vihsadas</a> (<a href="https://en.wikipedia.org/wiki/User_talk:Vihsadas" class="extiw" title="en:User talk:Vihsadas">talk</a>) 05:52, 7 March 2008 (UTC)
</p>
<a href="https://en.wikipedia.org/wiki/User:Vihsadas" class="extiw" title="en:User:Vihsadas">Vihsadas</a> 20:10, 14 April 2007 (UTC)
Original uploader was <a href="https://en.wikipedia.org/wiki/User:Vihsadas" class="extiw" title="en:User:Vihsadas">Vihsadas</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
13 April 2007 (original upload date)
Transferred from <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>