What causes those water growing toys to expand?

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What causes those water growing toys to expand?

In: Chemistry
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Imagine a sponge in your head. If you pick up that sponge, it’s very light. Why? The sponge is partially full of air.

Now, how do you fill the sponge up with water? If you try to drop the sponge in the water without squeezing it first, it’ll still hold some water, but almost none.

The “animal” in these growing water pills are sponges. When they’re created, they’re made at normal size. Since they’re sponges, they can be squished, and with machines, they can be squished a LOT. Small enough to fit into a little pill.