My son just asked me what the difference is between dry sand and wet sand, . I should have had him to some sort of beach in his nine years of life by now shame on me an dall I could do is explain it best I can knowing it is not the same thing. Good grief. Maybe this summer who knows. desimb
Or you could use the literal approach using any substitute for sand.
Dry is without moisture.
Wet is with moisture (not necessarily water)