The grain size of artificial snow in a simulated indoor environment was measured using a laser particle size analyzer to examine the growth law of snow crystals. The change in snow grain size with different heights of snow falling region

air-to-water pressure ratios

and ambient temperatures was analyzed. The experimental results show that the snow grain size increases with an increase in snow falling height

and the growth rate of the particle size gradually decreases. At a height of 80 cm

the crystal nucleus grows to a mature snow crystal

whose Sauter mean diameter is 57–73 μm. At this height

the snow grain size roughly follows a normal distribution

and the air-to-water pressure ratio and ambient temperature have a significant impact. When the air-to-water pressure ratio is 0.5 to 0.4

the snow-forming effect is good

manifested by a larger snow grain size and a more uniform distribution. Low-temperature environments can accelerate snow crystal growth. With a decrease in ambient temperature

the proportion of small snow crystals decreases

and the proportion of large snow crystals increases.