Size measurement of ultrafine particles can be best expressed in terms of___________________?
Correct answer: D. Surface area per unit mass
- A. Centimetre
- B. Screen size
- C. Micron
- D. Surface area per unit mass
Explanation
Ultrafine particles are too small for convenient measurement by ordinary screens, centimetres, or even practical screen-size descriptions. Their size is therefore commonly characterized through specific surface area, or surface area per unit mass.
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