Molecules will try to adopt the most stable conformation that minimizes strain. For cyclohexane, C 6 H 12, this would be the chair conformation. Letâs see why. If cyclohexane was planar, its structure would look like the picture to the left.
CPAP mask â There are many types of C-PAP masks. There are masks that just cover the nose (nasal cpap mask), and masks that cover just the mouth (oral masks), and of course, nasal-oral masks. There are also masks that are attached to oral appliance mouth devices.
Full face CPAP masks seal around your nose and mouth in the shape of a triangle and are held in place by four point headgear. These masks are used by people who breathe through their mouth during sleep and do not wish to use, or have not had success with, a nasal mask and chinstrap.