Which defect is caused due to the conversion of moisture to steam because of the heat of molten metal?

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A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated.

Casting defects can be broken down into five main categories: gas porosity, shrinkage defects, mould material defects, pouring metal defects, and metallurgical defects.


Which defect is caused due to the conversion of moisture to steam because of the heat of molten metal?