Water must take over
Fog occurs when the gaseous form of water (water vapor) begins to condense into water droplets (liquid water). So water is changing from a vapor (or gas) to a liquid.
Water vapor or the heat
No, humidity is water vapor - water in gaseous form. This type of water generally does not have the capacity to freeze. The exception is with the process of deposition, though there are certain requirements that must be met for this to occur.
The Sun
Water in the form of gas is called water vapor :3. Steam is a visible form of water vapor and can be considered a gas or mist.
There must be moisture in the air. When cooled, the water vapor in the air becomes liquid water- but if there is no moisture, then it cannot condense.
Water vapor and heat must be present for clouds to form. The water is evaporated from the ground and collected into a cloud.
condensationCondensation creates clouds. Clouds develop in an air mass that becomes saturated (relative humidity becomes 100%).Read more http://www.kgbanswers.com/in-what-process-must-occur-for-clouds-to-form/4008725#ixzz1EQ3cx57a
it usually needs solid particles or a solid surface
The pressure must have been higher than 1 ATM in the container.
Energy must be added to liquid water so that it reaches the boiling point, at which point the water will vaporize into water vapor.
Solid particles such as dust and water vapors, without either of these, there would be no clouds.