Discussion
An anti-foam additive is needed because a foaming oil
Answer: C
Correct answer: cannot maintain a load-bearing film
Foam is a mixture of oil and air, and air will not carry load, so a foaming oil loses its film and the surfaces come into contact. Foam also impairs heat transfer and can cause a pump to lose suction. Silicone anti-foam additives break the bubbles as they form, at very low concentration.
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