S.chand Publishing — Schand of class 9 chemistry

Sir I purchased your schand class 9 science book.In chemistry section, ch- 2, the size of collidal particle is between 1 to 100 manometer which is incorrect. The size of collidal particle is between 1 to 1000 manometer is correct one. please respond and try to solve my concern.
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Its nanometer unfortunately I write manometer in both time

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