Freeze

Freeze
Name	Freeze
Field	Cryology, Climatology, Cryobiology, Food science
Synonyms	Freezing, solidification, cryopreservation
Introduced	Ancient

Freeze

Freeze denotes the phase transition in which a liquid becomes a solid through thermal energy removal, commonly observed in water turning to ice and in processes across Cryobiology, Cryogenics, Climatology, Food science, and Materials science. The phenomenon underlies seasonal events such as the Little Ice Age and technological practices including cryopreservation, freeze-drying, and refrigeration. Scientific study of freeze intersects historic experiments by figures linked to Antoine Lavoisier, James Prescott Joule, Michael Faraday, and institutions like the Royal Society and the Smithsonian Institution.

Etymology and definitions

The English term "freeze" derives from Old English and Proto-Germanic roots paralleling words in Old High German and Old Norse, evolving alongside terminology in Latin and Greek used by scholars such as Pliny the Elder and Aristotle. In modern technical usage, freeze is defined in standards set by bodies like International Organization for Standardization and described in texts from National Institute of Standards and Technology and American Society of Heating, Refrigerating and Air-Conditioning Engineers. Legal and regulatory contexts involving freeze actions appear in documents from the United Nations and national agencies including the Environmental Protection Agency and Food and Drug Administration.

Physical processes and mechanisms

Freezing involves nucleation and crystal growth governed by thermodynamics and kinetics as formalized in work by Josiah Willard Gibbs, Ludwig Boltzmann, and Lev Landau. Heterogeneous nucleation at interfaces follows models developed by researchers at Max Planck Society and Imperial College London, while homogeneous nucleation rates match predictions from theories by Sir Ronald Fisher and investigations at Lawrence Berkeley National Laboratory. Solidification of multicomponent systems invokes concepts from Pierre Curie and Lev Landau symmetry breaking, and anisotropic growth yields structures described in studies from Massachusetts Institute of Technology and California Institute of Technology.

Types and contexts (food, environment, biological)

In food science, freezing protocols, cryoprotectants, and glass transition temperatures are central topics in literature from Nestlé Research Center, Campbell Soup Company research groups, and university departments such as Cornell University and University of Copenhagen. Environmental freezing includes seasonal sea ice formation in the Arctic Council and Antarctic Treaty regions, permafrost dynamics studied by teams at University of Alaska Fairbanks and Norwegian Polar Institute. Biological freezing and cryopreservation of gametes, embryos, and tissues reflect methodologies developed at Karolinska Institutet, Johns Hopkins University, and Oregon Health & Science University.

Measurement and modeling

Quantifying freeze uses calorimetry, cryo-electron microscopy, and thermal analysis tools from manufacturers like Thermo Fisher Scientific and Bruker Corporation, and numerical modeling implemented by groups at National Center for Atmospheric Research and European Centre for Medium-Range Weather Forecasts. Phase-field models and molecular dynamics simulations are applied in papers from Princeton University and ETH Zurich; field measurements reference datasets from National Aeronautics and Space Administration and European Space Agency remote sensing missions.

Applications and technologies

Technologies exploiting freeze include cryogenic storage at biobanks affiliated with World Health Organization programs and biotechnology firms such as Moderna and Pfizer. Industrial freeze techniques like freeze-drying are commercialized by companies including GE Healthcare and Merck Group and used in logistics governed by standards from International Air Transport Association and World Health Organization. Infrastructure responses to freezing involve engineering practices from American Society of Civil Engineers and equipment by Siemens and ABB for cold-region construction and energy systems.

Effects and hazards

Freezing poses hazards ranging from frostbite and hypothermia addressed in clinical guidelines by World Health Organization and American Medical Association to infrastructure damage detailed in reports by Federal Emergency Management Agency and Metropolitan Transportation Authority. Agricultural impacts on crops and livestock have been documented by Food and Agriculture Organization and research at Iowa State University and Universidad de Buenos Aires. Climate feedbacks involving freeze–thaw cycles affect carbon release studies by teams at University of Cambridge and Stanford University.

Cultural and historical perspectives

Freeze-related phenomena have influenced exploration histories of Ernest Shackleton, Roald Amundsen, and Robert Falcon Scott and shaped narratives in literature and art from Mary Shelley to Herman Melville and institutions like the British Museum and Smithsonian Institution. Policies and treaties addressing frozen regions involve the Arctic Council and Antarctic Treaty System, while economic and social effects of freeze events feature in chronicles of the Great Frost of 1709 and the Year Without a Summer, discussed in scholarship at University of Oxford and University of Cambridge.

Category:Phase transitions