Here's why:
* Nanometer: A nanometer is one billionth of a meter (1 nm = 10^-9 m).
* Nano-sized: The prefix "nano" signifies that the object is extremely small, measuring in the range of 1 to 100 nanometers.
* Particle Matter: This refers to tiny particles, often solid, suspended in a gas (like air) or liquid.
Examples:
* A typical virus might be around 100 nm in size.
* A single strand of DNA is about 2 nm wide.
* Nanoparticles used in sunscreen can be as small as 50 nm.
Important Note: Nano-sized particles are so small that they cannot be seen with the naked eye. They require specialized microscopes like electron microscopes to be visualized.
