<\/span><\/h2>\n\n\n\nTrimix is a mixture that contains three different gasses; helium, oxygen, and nitrogen. It is commonly used by technical divers, although recreational-level trimix certification courses are becoming more popular over recent years.<\/p>\n\n\n\n
<\/span>Trimix has three sub-classifications:<\/span><\/h3>\n\n\n\n\n- Normoxic trimix<\/strong>\n
\n- Contains a ‘normal’ amount of oxygen<\/li>\n\n\n\n
- The dive community considers 18-21% O2 normal<\/li>\n\n\n\n
- Whereas in medical terminology, normoxic means specifically 21% O2<\/li>\n\n\n\n
- The mix is breathable at the surface and at shallow depths<\/li>\n<\/ul>\n<\/li>\n\n\n\n
- Hypoxic trimix<\/strong>\n
\n- Contains less than 18% oxygen<\/li>\n\n\n\n
- The mix is not breathable on the surface<\/li>\n\n\n\n
- The %O2 determines a minimum safe depth for breathing<\/li>\n\n\n\n
- It is breathable once the ppO2 equals 0.18<\/li>\n<\/ul>\n<\/li>\n\n\n\n
- Heliotrox<\/strong>\n