How do you measure somebody’s breath

Question: How do you measure somebody’s breath
- Keywords:
  breath,
  measure
Asked by 286enqm46 to Martin on 12 Mar 2018.
- Martin Lindley answered on 12 Mar 2018:
  
  I use a Mass Spectrometer (or MS)
  
  you breath straight into a tube that is connected to the MS
  
  The MS then breaks down your breath into its smallest bits
  
  Those bits are then pushed down a very small but very long tube.
  
  Where those bits stick to the tube tells us about what they are made of.
  
  We then know about all the bits in your breath 🙂

Question: How do you measure somebody’s breath