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乾冰(dry ice)係固態二氧化碳,即係二氧化碳嘅冰[1]。佢好多時都用來做冷卻劑,好多地方都用到。
大氣之下,乾冰曉昇華,直接變做氣態。昇華點響-78.5 °C。昇華要嘅能量係(ΔHsub)喺-78.5 °C之下要571 kJ/kg。乾冰密度1.2到1.6 kg/dm³之間。乾冰冷凍效能好好,因為佢重凍過冰,但唔會留濕氣[2]。
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