 Although this technique does allow an individual to create low-lying fog "on the cheap" (when compared to the cost of renting cylinders of liquid CO2 or watertight containers with integral heaters), the volume of low-lying fog produced is typically less, and is more susceptible to atmospheric disturbances.Liquid nitrogen (N2) is used to create low-lying fog effects in a manner similar to dry ice.A machine heats water to at or near the boiling point, creating steam and increasing the humidity in a closed container.