Ngā mīhini whakamātao wai me te kurutē scroll e tuku wai ana mai i te 3 °C ki te paemahana rūma, ki raro iho rānei i te 0 °C ina whakaritea motuhaketia, mō ngā hangarewa, ngā taputapu mīhini me te whakamātao tukanga, kāore he pourewa whakamātao wai e hiahiatia ana.
Ko te wai putanga mai i te 3 °C ki te paemahana rūma; ka taea te whakarite motuhake kia raro iho i te 0 °C.
Ka whakamātao i ngā hangarewa, ngā taputapu mīhini, ngā pokapū machining me te hinu waipēhi, me te pūmau o te paemahana ki te ±1 °C.
Kei roto kē te whakatōtā whakamātao-hau: kāore he pourewa whakamātao wai, he rūma mīhini rānei e hiahiatia ana.
He parenga katoa: te raupapa wāhanga hiko, te taumaha rawa, te whakatio-kore me te aroturuki rere.
Ngā tuhipoka rārangi
I inehia ngā whakatauranga i ēnei āhuatanga: ko te wai whakamātao e kuhu ana he 12 °C, e puta ana he 7 °C, ko te whakaetonga he 2 °C, ko te tōtā he 50 °C, ko te ine-mahana maroke he 35 °C, ko te ine-mahana mākū he 24 °C. Whakahekea te wai mēnā kei raro iho i te 2 °C te paemahana o te taiao, mēnā rānei ka roa te mīhini e tū ana, hei tiaki i ngā ngongo parahi. Me whakanoho ngā wae whakamātao-hau ki tētahi wāhi pai te rere o te hau (ki runga tuanui, ki waho rānei). Ka panoni pea ngā taipitopito i te whakapainga ake o te hua, kāore he pānui i mua.