It is a common saying that water is a terrible lubricant. But, if you apply water to certain materials like glass, ice, soap, or tile, that surface becomes slippery when wet.
So what is the difference between a true lubricant, and something like water, which makes things slippery?
In: Chemistry
If the product is on a motor shaft, it’s lubricated. If it’s on a doorknob, it’s slippery.
Eli5
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