Question

How big are the particles of matter ?​

Answer 1

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if we look at them whether it is similar to how we expect this with in the microscopic world down to about the size of molecules .On smaller scales than that the quantum rule that govern individual particles start to become important .

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Answer 2

Answer:

If we take a look at matter, things behave similar to how we expect they should, in the macroscopic world, down to about the size of molecules: nanometer (10-9 meter) scales. On smaller scales than that, the quantum rules that govern individual particles start to become important.