When do clouds form dew point

Here a small particle of dust, pollen, or salt if near the ocean in the atmosphere would be sufficient to start some moisture condensing on it. The moisture would grow on this little particle, referred to as the condensation nuclei , to the point that we would have a small drop of water, called a cloud droplet. If this drop becomes large enough that its weight is significant compared the bombarding from all the molecules in the air, it may start falling toward the earth.

The particles need to become a certain size before gravity has a significant enough effect on them that they begin to fall toward the earth.

Clouds form for various reasons. Usually it is because air is lifted and cools. When air rises in the atmosphere it gets cooler and is under less pressure. The vapor becomes small water droplets or ice crystals and a cloud is formed.

These particles, such as dust and pollen, are called condensation nuclei. Eventually, enough water vapor condenses upon pieces of dust, pollen or other condensation nuclei to form a cloud. Some clouds form as air warms up near the Earth's surface and rises. Heated by sunshine, the ground heats the air just above it. That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it.

As it rises, its pressure and temperature drop causing water vapor to condense. Eventually, enough moisture will condense out of the air to form a cloud. Several types of clouds form in this way including cumulus, cumulonimbus, mammatus, and stratocumulus clouds.

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