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thursday 03 april 2025
Automatically translated from Basque, translation may contain errors. More information here. Elhuyarren itzultzaile automatikoaren logoa

Urak ez du 0°C-tan zertan izoztu

Joxerra Aizpurua Sarasola
26 July 2021
www.adnbilisim.com

Berriki egindako esperimentuan, Utah-ko Unibertsitateko (AEB) ikerlari talde batek ura –48ºC-ko tenperaturan egoera likidoan mantentzea lortu zuen. Hortik behera ura bat-batean izoztu zen, baina nola lortu zuten tenperatura horretan ura egoera likidoan egotea?

Ura 0ºC-tik behera egoera likidoan mantentzen dena, kasu ugari topa ditzakegu naturan; lainoan, adibidez, inguruko airearen tenperatura gradu askotan negatiboa izanik ur-tantak topa daitezke. Gakoa uraren purutasun-mailan datza, hau da, uretan normalean dauden ezpurutasunek (gatzak, hondarrak, eta abar) eragiten dute urak 0ºC-ren inguruan izoztea. Zenbat eta ur puruagoa izan orduan eta izozte-puntu baxuagoa lortuko da; Utah-ko ikerlariek –48ºC-tan finkatu dute, oraingoz, izozte-tenperatura.

Ez dirudi aplikazio praktiko izugarririk izango duenik saiakera honek, baina gutxienez, hobeto ulertuko dugu zergatik, batzuetan, euri-urak lurra ukitzean bat-batean izozten diren.

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