Discussion
Deodorisation runs at an absolute pressure of \( 3 \) mbar against atmospheric \( 1013 \) mbar. The vacuum expressed as a fraction of atmospheric is about
Answer: C
Correct answer: 0.3 per cent
Express the absolute pressure as a fraction of atmospheric:
\[ \frac{3}{1013} \times 100 = 0.296\% \approx 0.3\% \]
So the deodoriser works at roughly three-thousandths of atmospheric pressure. That depth of vacuum is what makes the process possible: it lowers the boiling points of the free fatty acids and odour compounds enough that they can be steam-stripped at a temperature the triglycerides themselves survive, typically 240 to 260 degrees Celsius.
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