Here's a breakdown:

* Water vapor: Water in its gaseous form, invisible to the naked eye.

* Particles in air: These can be dust, pollen, salt crystals, or even tiny particles of smoke. They act as condensation nuclei.

* Condensation: When water vapor molecules in the atmosphere cool down, they lose energy and slow down. This allows them to stick together and form tiny water droplets on the surfaces of condensation nuclei.

Why does condensation happen?

* Cooling: As air rises, it expands and cools. This cooling reduces the air's capacity to hold water vapor, forcing some of it to condense.

* Saturation: When the air is full of water vapor (saturated), any further cooling will cause condensation.

* Presence of condensation nuclei: These provide a surface for water vapor molecules to attach to, making condensation more likely.

Examples of condensation:

* Clouds: Formed by condensation of water vapor in the atmosphere.

* Dew: Formed when water vapor condenses on surfaces like grass or leaves.

* Fog: A low-lying cloud formed by condensation near the ground.

Let me know if you'd like to know more about any of these!