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Results 1 - 3 of 3 for Helium
  1. ... off by lighter fluid), computer cleaning spray, freon , helium, nitrous oxide (laughing gas), which is found in ...
  2. ... also be measured when you breathe nitrogen or helium gas through a tube for a certain period ...
  3. ... and a tracer gas, such as methane or helium. You hold your breath for 10 seconds, then ...