Rigar kwan fitila
Ana ayyana yanayin jika-bulb azaman zazzabi na fakitin iskar da aka sanyaya zuwa jikewa (zafin dangi 100%) ta hanyar ƙafewar ruwa a cikinsa, tare da latent zafi ta kunshin.  Ma'aunin ma'aunin zafi da sanyio mai jika yana nuna zafin jiki kusa da na gaskiya (thermodynamic) zazzabi mai zafi. Zazzabi jika-bulb shine mafi ƙarancin zafin jiki wanda za'a iya kaiwa ƙarƙashin yanayin yanayi na yanzu ta hanyar ƙazantar ruwa kawai.

Thermodynamic rigar-bulb zafin jiki shine yanayin zafin da ƙarar iska zai samu idan an sanyaya shi a hankali zuwa jikewa ta hanyar ƙazantar ruwa a cikinsa, duk wani zafi mai ɓoye yana  ta ƙarar iska. mutanen da suka dace da yanayin zafi ba za su iya gudanar da ayyukan yau da kullun na waje ba fiye da rigar kwan fitila na , daidai da ma'aunin zafi na  . Karatun karatu na  - daidai da ma'aunin zafi na  - ana la'akari da ƙayyadaddun ƙayyadaddun rayuwar ɗan adam har zuwa awanni shida na fallasa.

Hankali 
Idan an nannade ma'aunin zafi da sanyio a cikin rigar da ke da ruwa, zai kasance daban. Da bushewar iska da ƙarancin ɗanshi, da sauri ruwan zai ƙafe. Da saurin ƙafewar ruwa, ƙananan zafin jiki na ma'aunin zafi da sanyio zai kasance dangane da zafin iska.

Ruwa na iya ƙafewa kawai idan iskar da ke kewaye da shi za ta iya sha ruwa mai yawa. Ana auna wannan ta hanyar kwatanta yawan ruwan da ke cikin iska zuwa iyakar da za ta iya kasancewa a cikin iska— danshi mai dangi . 0% yana nufin iskar ta bushe gaba ɗaya, kuma 100% na nufin iskar ta ƙunshi duk ruwan da zai iya ɗauka a halin da ake ciki kuma ba zai iya ƙara shan ruwa ba (daga kowane tushe).

Wannan wani bangare ne na sanadin bayyanar yanayin zafi a cikin mutane. Yayin da iskar ta bushe, yawan danshi zai iya dauka fiye da abin da ke cikinta, kuma da saukin karin ruwa ya kafe. Sakamakon shi ne cewa gumi yana ƙafe da sauri a cikin busasshiyar iska, yana sanyaya fata da sauri. Idan yanayin zafi ya kasance 100%, babu ruwa da zai iya ƙafe, kuma sanyaya ta hanyar gumi ko ƙafewa ba zai yiwu ba.

Gabaɗaya 
Zazzabi jika-kwalwa shine mafi ƙarancin zafin jiki wanda za'a iya samu ta hanyar sanyayawar ruwa mai jika, da iska.

Don fakitin iskar da ta gaza cikakku (watau, iska mai ƙasa da 100 cikin 100 na dangi), zafin jiki na jika ya yi ƙasa da busasshen zafin rana, amma sama da zafin raɓa. Ƙarƙashin zafi na dangi (mafi bushewar iska), mafi girman rata tsakanin kowane biyu na waɗannan yanayin zafi guda uku. Sabanin haka, lokacin da yanayin zafi ya tashi zuwa 100%, alkaluma uku sun zo daidai.

Don iska a sanannen matsi da busassun zafin jiki, zafin jiki na thermodynamic rigar-bulb ɗin ya dace da ƙima na musamman na yanayin zafi na dangi da zafin raɓa. Don haka ana iya amfani da shi don ƙayyadaddun ƙimar waɗannan ƙimar. An kwatanta alaƙar da ke tsakanin waɗannan ƙimar a cikin ginshiƙi na mahaukata .

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Thermodynamic rigar-bulb zafin jiki 
Zazzabi na samfurin iska wanda ya wuce babban saman ruwa na ruwa a cikin tashar da aka keɓe shi ne zafin jiki na thermodynamic rigar-bulb-iska ya zama cikakke ta hanyar wucewa ta matsi-matsi, manufa, ɗakin jikewa na adiabatic.
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