Assertion: snorkel's tube | /r/HasProperty | waterproof
Facets:
Source sentences:
text: Accordingly, in the case of tubes 11 used in this practical example of application, appropriate setting of the pore size and porosity [porosity=(pore volume/total volume)×100] of the tube walls in accordance with the intended use of the snorkel produces tubes which are waterproof, but which have a good permeability with respect to gases, especially oxygen, dissolved in the water.