So far I always read, the lower volume the better and there is nothing else to care about. I understand basic logic - the smaller volume, the easier to equalize.
But then I read some threads on this forum, and some users often mention things like "compressibility ratio".
I even found a post here: http://apneaddict.blogspot.com/p/masks.html - where guy computes compressibility ratio when testing Micromask & using some magical math comes to conslusion that "compressibility ratio of 2.8 would suggest no need for equalization before 18m."
To be honest, I absolutely dont get it.
How does he compute that?
And most important, why it matters if mask is easily compressible or not?
Using my commons sense - when water is pressing on your mask, it compress air inside and thats why you need to put extra air in. So best would be if it mask was hard rock solid - so it cant be pressed => you dont need to put any air inside as u go down.
Or am I wrong? Can somebody explain me this? Thanks
But then I read some threads on this forum, and some users often mention things like "compressibility ratio".
I even found a post here: http://apneaddict.blogspot.com/p/masks.html - where guy computes compressibility ratio when testing Micromask & using some magical math comes to conslusion that "compressibility ratio of 2.8 would suggest no need for equalization before 18m."
To be honest, I absolutely dont get it.
How does he compute that?
And most important, why it matters if mask is easily compressible or not?
Using my commons sense - when water is pressing on your mask, it compress air inside and thats why you need to put extra air in. So best would be if it mask was hard rock solid - so it cant be pressed => you dont need to put any air inside as u go down.
Or am I wrong? Can somebody explain me this? Thanks