eli5 – why do solid oils become soft/spreadable from digging a finger into the container?

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I’ve witnessed this with face creams, coconut oil, and lip balm – anything solid at room temp. if you dig a finger into the product, or run your nail against it, what comes away is soft and spreadable, rather than a hard chunk. I imagine the cell structure is changing in some way, but – what way? why does this happen?

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Anonymous 0 Comments

> …if you dig a finger into the product, or run your nail against it, what comes away is soft and spreadable…

Try an experiment.

Take a plastic knife/spoon/spork/whatever and put it in the fridge/freezer for a couple minutes. Take another and put it in some warm water for a little bit.

Now take the cold spork and dig a little bit into the oil/cream/balm. Does it become soft or stay as more of a hard chunk?

Now take the warm spork (and dry it off with a towel or something) and dig a little bit into the oil/cream/balm. Does it become soft or stay as more of a hard chunk?

(SPOILERS BELOW)

If you do the little experiment above, you’ll probably “discover” that the warm spork makes the oil/cream/balm melty and smooth while the cold spork leaves it more clumpy and solid.

This is because the chunkyness/oilyness changes due to temperature! The ingredients in the oil/cream/balm have a melting point that is lower than your body temperature. Therefore, when your warm fingers (or even the somewhat-warm back of a fingernail) touch the stuff it warms up the substance and causes it to melt and become less chunky.

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