1. Weight loss between the cold batch and the finished molten metal. Loss of metal inevitably occurs during melting, primarily due to oxidation, but also due to evaporation. This is referred to as weight loss by oxidation. The oxides mix with the slag and are subsequently removed with it. According to the explanation above, weight loss by oxidation exclusively refers to metal losses occurring during melting or during any kind of treatment of the molten metal. Losses occurring during melting due to other reasons, by splashing for example, are not referred to as weight loss by oxidation.
2. Weight loss at increased temperatures due to oxidation of metal surfaces (see scaling or scale).