If I'm right, we had an experiment of testing out diffusion, and... um, I think it was potassium permanganate (Pardon me for my short memory), with the relief teacher while Mdm Riza was not in for a while. We we're told to drop a tiny amount of the potassium permanganate in a beaker of water and, not stir, but observer instead. Me and my partner, Yi Heng were noticing a very slow change in this process of the experiment. The potassium permanganate has given off a purple colour, but we're not focusing on that, what we're focusing on is that the colour began to spread into the colourless areas of the beaker and soon, it engulfed everything in a purple dye, making purple water, or, purple potassium permanganate solution. The teacher describes this process as diffusion, not an everyday word, but an everyday occurrence, like sugar dissolving in water without stirring.
After that, the teacher passed around a test tube with some colourless, soft, jelly (or the folks here in Singapore call it, Agar-agar, I think) and a... um.. let's see... I think... I think it's a Copper(II) Sulfate crystal in it. It's blue in colour and it seems that it's colour is diffusing into the jelly, or 'Agar agar', which is really quite interesting. I used to think that diffusion only happens in liquids and gases (In terms of gases, perfume diffusing in the air) but it happens in solids too.
We were given notes to learn more about these experiments and how do they work...
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