What is diffuse?

Diffuse means spreading out evenly, like when something moves from one place to another slowly and smoothly.

Imagine you have a cup full of warm water, and you drop in a few ice cubes. At first, the ice is cold and the water is warm. But after some time, the coldness spreads through the water, making the whole cup cooler, not all at once, but little by little. That’s what diffuse means: things mix together evenly over time.

If you pour blue food coloring into a glass of white milk, the blue starts where you poured it, and then it slowly moves out until the whole glass looks light blue. This is also diffusing, the color is spreading from one spot to fill up the whole space.

When you open a bag of cookies, the smell doesn’t just pop into your nose all at once. It takes time for the cookie scent to travel through the room and reach your nose. That’s diffuse happening in the air, the smell is spreading out slowly.