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Lab
Diffusion
Guided
With the forceps, put one crystal of potassium permanganate in the middle of the dish for the fridge
Put one crystal, the same size, in the middle of the dish for the warm place
Leave both dishes until the next day: one in the fridge, one somewhere warm
Lay the ruler across the purple in the cold dish, its zero at one edge
Read how wide the purple circle is, where the colour ends
Move the ruler to the warm dish, its zero at one edge of the purple
Read how wide the purple circle is in the warm dish
Laboratory
for the fridge, about 5 °C
for the warm place, about 35 °C
permanganate crystals
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ruler
to the middle
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