Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

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Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent. Answer: 20

Question context

This question is part of ⚗️ Chemical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.