Mask internal volumes...

[Agar4Life]

After reading many discussions about masks and their internal volumes (referred to below as IV) I think we should do some sort of test.

It should be pretty easy to find the IV of your mask.

Step 1: With the mask and your head underwater in a bucket of water/ swimming pool/ bath put on your mask so that it is FULL of water (with the strap - don't just hold it to your face).
Step 2: Take off the mask ensuring you catch all the water from in the mask.
Step 3: Measure the volume of water.

Archimedes would be proud.

What we can achieve by this is:
1. get an averaged approximation of the IV of many models of mask that there may not be official IVs figures for.
2. we can find out what the differences face shape make. If you have been sporting a big nose or big cheekbones, you will likely have a lower IV.
If we can get a bunch of measurements for the same model mask then we can see the variation involved due to face shape.

I'm not sure how much this will prove, but it may be worth finding out.

 

[sanso]

While the internal volume as such isn't a constant because we all have different faces (right?) - this would certainly work to find out how the masks compare to each other. - So that's good.

One might also try to put water in the mask, then push the mask to the face as much as possible to find out how compressible it is.

 

[Agar4Life]

One might also try to put water in the mask, then push the mask to the face as much as possible to find out how compressible it is.

A good idea, but pressure from the water acts on all sides not just from the front. I don't think it will have the same result as a dive.

 

[sanso]

A good idea, but pressure from the water acts on all sides not just from the front. I don't think it will have the same result as a dive.

I think with masks with glass lenses the difference will not be as big as with, say, a sphera. At least that test will show a rough estimate.