...small cloud, to form inside a house? Could a specific air mass inside a house (or castle, perhaps) become dense, or cloudy? What could cause this?

Sometimes, after an afternoon rainstorm, the hot street will seem to "steam". Water vapor condenses around particles or nuclei creating wisps of clouds that look like steam, or smoke. Without outside sunlight, or evaporation, without smoke of any kind, what phenomenon could cause an inside air mass to become cloudy?

Trying to isolate such a phenomenon in relation to ghost sightings.

Any answers, thoughts, or ideas appreciated. Would like to brainstorm scientific and/or alternative explanations, including science fiction.

Examples: temperature, spirits, humidity, gravity wells, life force, gamma rays, x-rays, methane gas, dust, magnetism, static electricity, even a defective alien invisiblity shield...anything you think is a possible cause for air inside a house to spontaneously mass, fog up, or cloud.

If you can, please explain with details. Thank you

__________________
Best of Yahoo!

i get a cloud of steam every time I make pasta.I guess under the right conditions it could travel around.That's a lot more likely then a ghost.Any explanation would be more likely then a ghost,though.

__________________
Yahoo!