Powder particle size unit conversion table

Particle size is a critical measurement in various industries, often expressed in different units such as micrometers (µm), nanometers (nm), and mesh sizes. Here's a breakdown of the relationships:

- **Micrometer (µm)**: Equivalent to $10^{-6}$ meters. One micrometer equals 1000 nanometers.

- **Nanometer (nm)**: Equivalent to $10^{-9}$ meters. One nanometer is $10^{-3}$ micrometers.

- **Mesh Size**: A measure of particle fineness, where higher mesh numbers correspond to finer particles. For example:

- 18 meshes = $10^{-3}$ meters (1 mm)

- 180 meshes = $10^{-4}$ meters (0.1 mm)

- 18,000 meshes = $10^{-6}$ meters (1 µm)

- 180,000 meshes = $10^{-7}$ meters (0.1 µm)

- 1.8 million meshes = $10^{-8}$ meters (10 nm)

- 18 million meshes = $10^{-9}$ meters (1 nm)

For reference:

- Viruses typically measure around **100 nm**.

- The fineness of particles in micrometers and nanometers can be converted as follows:

- 1 micrometer = 18,000 nanometers (approximate equivalence for fineness).

- 1 nanometer = $10^{-7}$ to $10^{-9}$ meters, depending on the level of precision.

Understanding these conversions is essential for applications requiring precise particle size control, such as filtration, material processing, and quality inspection.