US$ 88.33
Snell's law
Twelve-piece brass slotted mass set spanning 1 to 500 grams
Illustrates liquid-density changes with temperature using a weighted 75mm hollow copper sphere that floats in 15°C water and sinks as the water warms to 30°C
cerebellum
Karst, Caves and Water Action Landform Model, 2-Part Type_Geographical Snell's lawTwo part karst landform model with a removable surface that exposes caves, stalagmites, stalactites, and an underground lake, mapping 32 keyed features across the subsurface.