* Nanometer (nm): One billionth of a meter (10⁻⁹ m). This is incredibly small, about the size of an atom or a few atoms strung together.
* Micrometer (µm): One millionth of a meter (10⁻⁶ m). This is larger than a nanometer, but still microscopic. Think of the size of a bacterium or a red blood cell.
Here's a simple way to remember it:
* Nano is smaller than micro.
* Think of "nano" as "tiny" and "micro" as "smaller than you can see".
Here's a table to help visualize the difference:
| Unit | Symbol | Size (in meters) | Examples |
|--------------|--------|-------------------|--------------------------------------------|
| Nanometer | nm | 10⁻⁹ | Atoms, DNA, viruses |
| Micrometer | µm | 10⁻⁶ | Bacteria, red blood cells, dust particles |
In short:
* Nanometers are used to measure things at the atomic and molecular level.
* Micrometers are used to measure things that are visible under a microscope.
