In order to characterize the particle size of powders, the USP uses terms like coarse and fine. What is the meaning of these terms? The proportion of powder that will dissolve in a given period of time The proportion of powder that flows through a standard funnel in a given period of time The proportion of powder that will be retained on top of a standard sieve, and not pass through The proportion of powder that will pass through the openings of a standard sieve
Question
In order to characterize the particle size of powders, the USP uses terms like coarse and fine. What is the meaning of these terms? The proportion of powder that will dissolve in a given period of time The proportion of powder that flows through a standard funnel in a given period of time The proportion of powder that will be retained on top of a standard sieve, and not pass through The proportion of powder that will pass through the openings of a standard sieve
Solution
The terms "coarse" and "fine" used by the USP (United States Pharmacopeia) to characterize the particle size of powders refer to the proportion of powder that will pass through the openings of a standard sieve.
In other words, a "fine" powder is one where a larger proportion of the particles are small enough to pass through the sieve, while a "coarse" powder is one where a larger proportion of the particles are too large to pass through the sieve and are retained on top. This method allows for a standardized measurement of particle size.
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