Which effect is created when smoke is laid close to the floor and produced by chilling it?

The creation of a smoke effect that remains close to the ground is referred to as "low smoke." This effect is achieved by chilling the smoke, which makes it denser and causes it to settle instead of rising. The low temperatures reduce the buoyancy of the smoke particles, allowing them to hug the floor for longer periods, effectively creating a visually striking atmosphere that can enhance the mood of a scene or add a sense of mystery.

"Heavy mist" typically implies a thicker, cloud-like effect that may not necessarily remain close to the ground. "Ground fog" is a term that overlaps with low smoke, but it generally describes a more natural, environmental phenomenon rather than a created effect specifically using chilled smoke. "Floor haze" suggests a subtle, diffused effect, which does not specifically denote the denser, low-lying quality of low smoke and could involve both fog and ambient lighting rather than just the chilled, dense smoke close to the floor. Thus, low smoke aptly defines the effect produced by chilling smoke and laying it close to the floor.