What does the presence of moisture in smoke typically produce?

The presence of moisture in smoke typically produces white smoke. This occurs because when water vapor is present, it can condense into tiny water droplets as it cools. This process creates a white appearance, which is often associated with burning materials that contain a significant amount of water, such as green vegetation or building materials that are wet. White smoke can also indicate that combustion is incomplete or that there is a low-temperature fire, where moisture content from the burning fuel contributes to the smoke's visual characteristics.

The other options represent different phenomena associated with smoke but do not accurately reflect the impact of moisture. Black smoke is usually associated with the burning of hydrocarbons or materials that produce a lot of soot, while clear smoke generally indicates a very hot and clean burn with little particulate matter. The absence of smoke altogether does not relate to the moisture content but rather to whether combustion is occurring.