Laboratory products
The trouble with particle size analysis is that size is often quoted as a single number, such as, a 500 micron powder. The only particles that fulfil this
criterion are those that are perfectly spherical in shape and exactly the same size. A simple analogy would be taking a ball bearing from a store bin.
One could safely assume that, within the specified tolerance, all the ball bearings would be spherical in shape and of the same size.