Stoughton, USA – July 07th, 2023 – Sub-micron particles are very small particles that are less than one micron in diameter. Here are some reasons why sub-micron particles cannot be described with mass concentration values:
- Size: Sub-micron particles are too small to be accurately measured using mass concentration values. Mass concentration is a measure of the amount of a substance per unit volume, but sub-micron particles are so small that their mass is negligible.
- Number: Sub-micron particles are typically measured in terms of their number concentration, rather than their mass concentration. This is because the number of particles is more important than their mass when it comes to their effects on health and the environment.
- Variability: Sub-micron particles can vary widely in their composition and size, which makes it difficult to accurately measure their mass concentration. This is because different types of particles have different densities, and some particles may be more or less dense than others.
Overall, sub-micron particles are too small and variable to be accurately described using mass concentration values. Instead, they are typically measured in terms of their number concentration per cubic feet or cubic meter, which provides a more accurate picture of their effects on health and the environment.