Assertion: snorkel's portion | /r/HasAspect | cross-sectional area
Facets:
Source sentences:
text: The object of the invention is achieved by selecting the cross-sectional area of the exhaust tube so that all or a portion of the exhaust tube has a cross-sectional area which is large enough so that a swimmer can exhale normally through the tube while swimming without having to use extra exhaling force, yet sufficiently small to cause the purge valve 40 to open when a swimmer exhales with more force than normal to purge accumulated water.
text: The object of the invention is achieved by selecting the cross-sectional area of the exhaust tube so that all or a portion of the exhaust tube has a cross-sectional area which is large enough so that a swimmer can exhale normally through the tube while swimming without having to use extra exhaling force, yet sufficiently small to cause the purge valve 40 to open when a swimmer exhales with more force than normal to purge accumulated water.