What is the most likely cause of air bubbles appearing on the surface of a casting?

Show Answers

Incorrect pressure applied during castingInadequate heating of the investment materialWrong angle of the sprue placementPoor wetting of the wax pattern by the investmentExcessive cooling rate of the casting

Explanation

Air bubbles on the casting surface usually result from the investment not properly wetting the wax pattern, which traps air and causes defects. Other factors like casting pressure, heating, or sprue angle are less likely to produce this specific issue.