Kwarin numfashi

Kogon numfashi ko kogon barometric wani nau'in kogon ne da ba kasafai ba wanda a cikinsa matsatsin yanayi tsakanin ciki da wajen kogon yana sa iska ta shiga ko fita daga cikin kogon.   Ma'anar iskar da ke gudana ta cikin kogo abu ne na kowa, amma a yawancin kogo ana haifar da wannan iska ta hanyar bambance-bambancen yanayin zafi maimakon matsa lamba; A cikin kogon barometric tsarin zafin jiki na cikin kogon bai isa ya haifar da irin wannan iska ba.  Gudun iskar iska a cikin kogon barometric yana da alaƙa kai tsaye tare da bambancin matsa lamba na yanayi tsakanin ciki da waje na kogon.  Lokacin da iskan iska a wajen kogon ya yi sama da na cikin kogon sai iskar ta buso cikin kogon kuma akasin haka; idan ma'aunin iska ya kasance a daidaici babu iska. 

A wasu kogo na numfashi, za a iya auna iskar da ma'ana kawai kusa da ƙofar. Wannan yana faruwa a cikin kogo waɗanda ke da manyan manyan hanyoyi masu faɗi, musamman kogon iska a South Dakota, Amurka, da Kogon Lechuguilla a New Mexico, Amurka.  A cikin kogo waɗanda galibi sun ƙunshi kunkuntar hanyoyi, irin su Jewel Cave, kuma a South Dakota da ƙasa da  nesa da Kogon Iska (ko da yake ba a haɗa kogon),  ana iya auna yawan iska a wurare da yawa a cikin tsarin kogon.  Ka'idar barometric na iska a Jewel da Wind Caves an fara lura da Herb Conn a cikin 1966.   Kogon Jewel da Wind Cave sune mafi kyawun rubuce-rubucen misalai na kogo na numfashi.

 Geology 
Duk kogon numfashi da aka sani sune kogon warwarewa, kuma kogon numfashi yana da tsayi fiye da sauran kogon. Hudu daga cikin kogo goma mafi dadewa a duniya sune kogo masu numfashi (wato Jewel Cave, Cave Wind, Clearwater Cave, da Lechiguilla Cave).

Wasu misalan kogon numfashi sun haɗa da:

 Butler Cave, Virginia, Amurika 
 Cave of the Winds, Colorado, Amurika 
 Kogon Clearwater, Malaysia 
 Jewel Cave, South Dakota, Amurika 
 Lechuguilla Cave, New Mexico, Amurika 
 Peștera Vântului, Romania
 Postojna Cave, Slovenia 
 Wind Cave, South Dakota, Amurika 

 Manazarta