| 摘要 |
PCT No. PCT/AU86/00158 Sec. 371 Date Feb. 3, 1987 Sec. 102(e) Date Feb. 3, 1987 PCT Filed Jun. 3, 1986 PCT Pub. No. WO86/07373 PCT Pub. Date Dec. 18, 1986.A method of making artificial snow by mixing water with a surfactant, the surfactant preferably forming 0.03% to 5% of the mixture by weight; aerating the mixture to form a foam of bubbles; and freezing the foam to form the snow crystals. The mixture is preferably aerated with air in the ratio water:air in the range 1:2 to 1:3 (v/v). The foam of bubbles is frozen by laying it over a refrigerated grid laid over the skiing slope and the foam is preferably laid and frozen in layers until the desired depth of snow is achieved.
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