What is the definition of the particle?

A particle is a small piece of anything. If you mean a subatomic particle, that's a body that you can't see because it is so incredibly small, though it does have a miniscule mass and internal structure. These particles are even smaller than atoms. You can also say a crumb or speck of something is a particle.

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the answer is 0.42 is that is an option. this question provides no info