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ID number:413576
 
Author:
Evaluation:
Published: 08.12.2008.
Language: Latvian
Level: Secondary school
Literature: 11 units
References: Not used
Extract

Fizikālās īpašības
Alva ir samērā viegli kūstošs metāls

Pastāv trīs alvas modifikācijas:
baltā alva;
pelēkā Alva;
trauslā alva.

Baltā alva.
Sudrabaini balts, mīksts metāls.
Zema kušanas temperatūra, tā ir viegli stiepjama.
Alvas kliedziens.

Pelēkā alva.
Zemākā temperatūrā par 13,2°C, baltā alva sāk pārvērsties pelēkajā alvā.
Alvas mēris.
Ap -30 grādu temperatūru baltā alva sairst pelēkā pulverī.

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