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Rasos taškas

Rasos taškas – temperatūra, kurioje vandens garai, esantys ore, virsta sočiaisiais (t. y., oras, turintis pradinę temperatūrą ir sąlyginį drėgnį, daugiau nebegali priimti drėgmės). Rasos taške yra pusiausvyra tarp garavimo ir kondensacijos procesų. Šioje temperatūroje ant santykinai šaltų paviršių susiformuoja rasa arba šerkšnas (pastaruoju atveju vadinama šerkšno tašku).

Santykinis oro drėgnis rasos taške yra 100%.

rasaJeigu oro temperatūra yra 20°С, o drėgnis – 50%, tai reiškia, kad ore yra 50% maksimalaus vandens kiekio, kuris gali ten būti. Jeigu oras atšąla iki 9,3°С, tai jo sąlyginis drėgnumas padidėja iki 100%, t. y. 9,3°С temperatūros oras iki ribos prisotintas drėgmės. Jeigu oras bus atšaldomas ir toliau, tai prasidės kondensato susidarymas – rasojimas, nes oras nebesugebės išlaikyti vandenį. Patalpose šią drėgmę tenka pašalinti į išorę vėdinant. Drėgmės perteklius gali būti šalinamas priverstinai vėdinant.

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