Clouds will from when condensation nuclei are present and:

air reaches its dewpoint.
is that all true?

Since this is not my area of expertise, I searched Google under the key words "cloud formation" to get these possible sources:

http://www.google.com/imgres?imgurl=http://www.weatherquestions.com/Cloud_formation_convective.gif&imgrefurl=http://www.weatherquestions.com/How_do_clouds_form.htm&h=95&w=126&sz=13&tbnid=y26vuBzZ1k8J:&tbnh=95&tbnw=126&prev=/images%3Fq%3Dcloud%2Bformation&sa=X&oi=image_result&resnum=1&ct=image&cd=2
http://www.google.com/imgres?imgurl=http://www.fas.org/irp/imint/docs/rst/Sect14/cloudform1.jpg&imgrefurl=http://www.fas.org/irp/imint/docs/rst/Sect14/Sect14_1b.html&h=106&w=126&sz=61&tbnid=j3OFP-BSalEJ:&tbnh=106&tbnw=126&prev=/images%3Fq%3Dcloud%2Bformation&sa=X&oi=image_result&resnum=1&ct=image&cd=3
http://en.wikipedia.org/wiki/Cloud
http://www.infoplease.com/ce6/weather/A0857399.html
http://www.physicalgeography.net/fundamentals/8e.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.

Yes, that is correct. Clouds form when two conditions are met: condensation nuclei are present and the air reaches its dewpoint. Let me explain how these conditions contribute to cloud formation:

1. Condensation nuclei: These are tiny particles such as dust, smoke, or salt crystals that serve as a surface for water vapor to condense onto. They provide a solid or liquid surface for water droplets to form. Without condensation nuclei, it would be difficult for water vapor in the air to condense and form visible clouds.

2. Dewpoint: The word "dewpoint" refers to the temperature at which the air becomes saturated with water vapor, leading to condensation. When the air temperature reaches the dewpoint, it can no longer hold all the moisture it contains, causing the excess water vapor to condense into visible water droplets. These droplets form the clouds we see in the sky.

So, in summary, when condensation nuclei are present in the air and the air reaches its dewpoint temperature, the conditions necessary for cloud formation are met.