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7. Molekuliu saveikos rei kiniai kietuose kunuose

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7. Molekuliu saveikos rei kiniai kietuose kunuose

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    1. 7. Molekuliu saveikos reiškiniai kietuose kunuose Kietasis kunas, tai tokia medžiagos agregatine busena, kuriai budinga formos ir turio pastovumas. Daleles virpa apie saveikos lemtas pusiausvyras padetis. Tarp molekuliu vyrauja traukos jegos. Pastovi dinamine pusiausvyra nusistovi, kai kiekvienos molekules aplinkoje kitos molekules išsidesto griežtai apibrežta tvarka, kuri periodiškai kartojasi visame turyje. Tai ir yra kristaline sandara.

    2. Kristalai tai kunai, kuriuose vienodos atomu grupes periodiškai pasikartoja. Amorfiniai kunai, kuriuose atomu grupes išsideste netvarkingai. Polikristalai tai kunai, kuriuose maži kristalai išsidesto netvarkingai vienas kito atžvilgiu.

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