system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does grease lubricate whatever it's used on but still manages to stick to the surface it's applied to?
gpt
Basically whenever anything touches another thing, the molecules either try to bond or repel each other. It has to do with the polarity of the molecules. Think magnetism, but on the absolute smallest scale. When you have two things move against each other they also cause friction, which generates heat energy. Lubricants create a barrier between the objects, reducing friction, and reducing heat. Lubes also feel sticky because some of the molecules bond to the surface they are coating, but because they are a liquid, they can flow freely around the object.