Why does stirring your spoon in a cup dissolve salt or sugar?
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Water is a liquid, lots of molecules bouncing around in a sort of soupy wiggly blob. Salt and sugar are solid, lots of atoms stacked up like Lego bricks in a big crystal. Water molecules are like those Lego brick remover tools that can yank that stubborn thin 1×2 block off the corner of your castle. When this happens, the water molecule gets full, just like the Lego remover tool. Imagine if you had a Lego castle in your bedroom and then you completely filled it with living Lego remover tools. The outer layers of the castle would be removed immediately, but now most of the remover tools are full. Imagine they wiggle around a bit but don’t exactly swim like fish. So now the process stalls and you have partially disassembled castle. Now imagine someone comes in with a giant shovel and scoops the full remover tools away from the castle and let’s fresh ones get near. Even better, they bash the castle with the shovel and spread a bunch of castle chunks around the room. Now it will quickly end up with every single piece stuck in a remover tool.
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