Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point.

For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid–liquid transition temperatures. For example, agar displays a hysteresis in its melting point and freezing point. It melts at 85 °C (185 °F) and solidifies from 32 °C to 40 °C (89.6 °F to 104 °F).[1]


Most liquids freeze by crystallization, formation of crystalline solid from the uniform liquid. This is a first-order thermodynamic phase transition, which means that, as long as solid and liquid coexist, the temperature of the whole system remains very nearly equal to the melting point due to slow removal of heat when in contact with air, which is a poor heat conductor. Because of the latent heat of fusion, the freezing is greatly slowed down and the temperature will not drop anymore once the freezing starts but will continue dropping once it finishes.[citation needed] Crystallization consists of two major events, nucleation and crystal growth. Nucleation is the step wherein the molecules start to gather into clusters, on the nanometer scale, arranging in a defined and periodic manner that defines the crystal structure. The crystal growth is the subsequent growth of the nuclei that succeed in achieving the critical cluster size.

Other Languages
العربية: تجمد
asturianu: Solidificación
Bân-lâm-gú: Gêng-kò͘
български: Втвърдяване
čeština: Tuhnutí
chiShona: Gwamba
Deutsch: Erstarren
eesti: Tahkumine
Ελληνικά: Πήξη
español: Solidificación
euskara: Solidotze
فارسی: انجماد
français: Solidification
한국어: 결빙
हिन्दी: हिमीकरण
hrvatski: Ledište
Bahasa Indonesia: Pembekuan
italiano: Solidificazione
עברית: הקפאה
Latina: Gelatio
lietuvių: Kietėjimas
македонски: Мрзнење
Bahasa Melayu: Pembekuan
မြန်မာဘာသာ: ခဲခြင်း
Nederlands: Stolling
日本語: 凝固
norsk: Frysing
norsk nynorsk: Frysing
Plattdüütsch: Verklamen
polski: Krzepnięcie
português: Solidificação
română: Solidificare
русский: Отвердевание
Simple English: Freezing
slovenčina: Tuhnutie
slovenščina: Strjevanje
کوردی: بەستن
српски / srpski: Мржњење
srpskohrvatski / српскохрватски: Ledište
தமிழ்: உறைதல்
Türkçe: Donma
українська: Замерзання
Tiếng Việt: Đông đặc
吴语: 凝固
中文: 凝固