Span
A calculated value that describes the breadth of the particle size distribution by looking at the size of the particle below which 90% of all particles are found (d90), the median and the size of the particle below which 10% of all particles are found (d10).
The Span is calculated from the following equation:
Where:
d90 = particle size below which 90 % of the particles are described
d10 = particle size below which 10% of the particles are described
d50 = particle size below which 50% of the particles are described, also known as the median
Broader distributions have a larger span while narrower distributions have a smaller span.
