Which is correct, number or amount, in the following two sentences?

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I have encountered the following two sentences. In the first sentence, the writer use the word ‘number’ and the word ‘amount’ in the second one.
Can I ask if both are correct? or which expression is correct?

In 2013, British ecologist Mark Browne/ launched a project to help reduce the number of microfibers released into the oceans.
Avoiding [personal care products that have microbeads in them] and [clothing that was made from synthetic fibers]// would reduce the amount of microplastics entering marine and coastal environments.

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[+3] - engineer - 11/19/2019"Number" is normally used when you can count the items. "Amount" is used for something you wouldn't count. In normal conversation, no one cares too much....

@suwon kim,

"Number" is normally used when you can count the items. "Amount" is used for something you wouldn't count. In normal conversation, no one cares too much. This website discusses it some more.

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@suwon kim,

Numbers would mean a measurable thing. 15 microfibers is a number.

Amount would be an estimate of something. Lots of microplastics, or some microplastics.

English is a terrible combination of three languages pretending to be one.

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@engineer,

I mean the following two are confusing to me. That is why I am asking which is correct. In the first, can you native speakers " COUNT fibers?
In the second, "microplastics" is plural, but they use the word "amount."

the number of microfibers
the amount of microplastics

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@suwon kim,

"Number of microfibers" brings to mind a rough estimate count of microfibers, e.g. trillions, quadrillions. It's not incorrect.

"Amount" is applicable to the plural word "microplastics." You would use "amounts" if you were implying a distinction among several types or kinds of microplastics.

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Which is correct, number or amount, in the following two sentences?

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