Deadspace (in breathing apparatus)
Encyclopedia
Deadspace in a breathing apparatus is excess space which the flow of air or breathing gas
must pass through and back again as the user breathes in and out, increasing the necessary respiratory effort to get the same amount of usable air or breathing gas, and risking accumulation of carbon dioxide
from shallow breaths. It can be reduced by:
A smaller space around the mouth increases the "gasmaskyness" distortion of speech.
Breathing gas
Breathing gas is a mixture of gaseous chemical elements and compounds used for respiration.Air is the most common and only natural breathing gas...
must pass through and back again as the user breathes in and out, increasing the necessary respiratory effort to get the same amount of usable air or breathing gas, and risking accumulation of carbon dioxide
Carbon dioxide
Carbon dioxide is a naturally occurring chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom...
from shallow breaths. It can be reduced by:
- Using separate intake and exhaust passages with one-way valves placed in the mouthpiece.
- With a fullface mask:
- Keeping its inside volume small.
- Having a small internal orinasal maskOrinasal maskAn orinasal mask is a breathing mask that covers the mouth and the nose only. It may occur independently, as an oxygen mask, or on some anaesthetic apparatuses, or it may occur inside a fullface mask on a scuba set or an industrial breathing set to reduce the amount of dead space...
inside the main mask.
A smaller space around the mouth increases the "gasmaskyness" distortion of speech.