dehumidifier
If the ignition temperature of a substance is lower than the room temperature where it is, then that substance ignites.
A dehumidifier is great for a children's room because it can protect a children's room from dust mites.
dehumidifier has a cooling coil and a heating coil. When air is passed through the coiling coil, moisture in the air condenses and drips in the bucket. Heating coil heats the air back to room temperature.
Yes, it is necessary to close off the room that the dehumidifier is opperating in. This ensure the unit can function properly.
That would depend on the size of the room and the humidity.
just install a dehumidifier
Enter the type of room (or square footage) to the dehumidifier calculator and it reveals not only how many pints of capacity you need, but which dehumidifiers fit your needs. http://www.dehumidifierratingsreviews.com/dehumidifier-calculator/
The dehumidifier would in a sense "win" this battle. Since the dehumidifier sucks water out the air and the humidifier adds water to it. The humidifier would run out of water before the dehumidifier sucks all the water out the air.
Vegetable oils
No, leaving a dehumidifier on in a room would not turn someone into a crisp. People often leave dehumidifiers running all the time to remove moisture from the air or keep humidity levels at a comfortable level.
The boiling point of pure HCl is lower than the room temperature.