RATE of diffusion must be expressed as number of particles moved per unit time. Write this as a word.

Can you please teach me this?

Certainly! To express the rate of diffusion as the number of particles moved per unit time in words, you can describe it as "the number of particles that move or diffuse across a given area or distance in a specific time period." This indicates the quantity of particles that undergo diffusion within a certain timeframe.

However, it's important to note that this description might vary depending on the context or the specific units being used. The rate of diffusion can be expressed in different ways, such as molecules per second, ions per minute, or any other appropriate unit of particle count and time. It's essential to clarify the specific units to accurately communicate the rate of diffusion.