Ukuhlelwa kweentsinga zeglasi Ngokwemilo kunye nobude, ifayibha yeglasi inokwahlulwa ibe yifayibha eqhubekayo, ifayibha yobude obusisigxina kunye noboya beglasi;Ngokokwakheka kweglasi, inokwahlulwa ibe yialkali yasimahla, iyakwazi ukumelana neekhemikhali, ialkali ephezulu, ialkali ephakathi, amandla aphezulu, iela ephezulu...
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