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Cookie
Duration
Description
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11 months
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11 months
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11 months
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Με την τριβή (εάν είναι παρατεταμένη και αρκετά ισχυρή) δημιουργούνται τέτοιες θερμοκρασίες με αποτέλεσμα να πυρακτώνονται τα ρινίσματα των υλικών. Τα ρινίσματα αυτά τότε παρατηρούνται ως “σπινθήρες”.