[Physics] Rice grains sticking to a polythene bag. Why and how

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Today just now while I was filling rice into a polythene bag. I noticed that some grains inside the polythene bag were sticking to the sides of the bag. I tried to replicate this on the outside of the bag and got positive results.

I am now searching for a reason as to why this is happening. My guess is that static electricity is involved. However that raises the question how does filling rice in a plastic bag result buildup of charges on the rice grains and polythene.

TL;DR

what factors can cause rice grains to stick to polythene bags and how ?

Best Answer

Some kind of static electricity, I suppose.

The polythene bag may be charged (for example, if it had been rubbed on anything or it has come in contact with another charged object) due to which there is either a deficit or excess of electrons. The charged bag induces a charge in the rice grains and attracts them.

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