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Precipitation is a general term for when one substance settles out of another. More specifically when a solute settles out of a solvent. I am assuming you are asking about precipitation that we know as rain.

Heat evaporates water and that water vapour becomes a solute in the solvent called the atmophere. When the atmosphere can't hold any more water vapour, the vapour condenses back into liquid water and falls to earth. The key idea is this. Colder air won't hold as much water as warmer air. What this means is that when air cools, at night or when it rises into a cooler environment higher in the atmosphere, its ability to hold water decreases and this is what most often causes water to condense into liquid and "fall" (precipitate) out of the air.

One other condition that needs to be met is that there are nuclei; tiny microscopic particles for the water to condense on. Usually these are dust particles or pollution.

So, short answer. Air cools and loses the ability to hold water vapour. The water condenses on a nuclei, becomes a water droplet and grows too heavy to stay suspended in the atmosphere. So it falls the the ground.

Hope this helps.

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14y ago
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11y ago

A precipitate is the product of a precipitation reaction, when an insoluble compound is formed. Example:
BaCl

2 + Na2SO4 =

BaSO

4 + 2NaCl
Barium sulfate is a white precipitate.


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12y ago

it is caused by evaporation

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Q: What causes precipitation to form?
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