This artificial fog is most commonly used in professional entertainment applications, but smaller, more affordable fog machines are becoming common for personal use. Fog machines can also be found in use in a variety of industrial, training, and some military applications as well. Typically, fog is created by vapourizing proprietary water and glycol-based or glycerine-based fluids or through the atomization of mineral oil. This fluid (often referred to colloquially as fog juice) vapourizes or atomizes inside the fog machine. Upon exiting the fog machine and coming into contact with the moisture in the outside air the vapour condenses, resulting in a thick visible fog.