diffusion

1. (countable, uncountable)The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.

   the act of dispersing or diffusing something

2. (countable, uncountable)The scattering of light by reflection from a rough surface, or by passage through a translucent medium.

   Streuung

   рассе́иваниеrasséivanije

3. (countable, uncountable)The intermingling of the molecules of a fluid due to random thermal agitation.

   gaseous diffusion

   Diffusion

   диффу́зияdiffúzija

4. (countable, uncountable)The spread of cultural or linguistic practices, or social institutions, in one or more communities.

   the spread of social institutions (and myths and skills) from one society to another

5. (countable, uncountable)The gradual spread and adoption of goods or services.

6. (countable, uncountable)Exchange of airborne media between regions in space in an apparently random motion of a small scale.

7. (countable, uncountable)The movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration.

   (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration

1. Diffusion is passive because it doesn't require an external source of energy.

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