What Do You Observe?

Matheous-2 | 09:40 Sun 16th Aug 2015 | Science

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When you strike a steel hammer on a vice or anvil and produce sparks?
Are these molecules or atoms that fly off before our eyes?
My apologies if this has been covered before (sure it has)....
Thank you.

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What Do You Observe (Part 2)

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Just to expand a little on what woofgang has said, the smallest object that can be resolved with the naked human eye at a distance of a metre or so is about 0.1mm. (This is not absolute: it may be anything from 0.05mm or less to 0.5mm or more depending on a number of factors – not least how “good” the particular eye is. But, as will be seen below, it does not...

15:10 Mon 17th Aug 2015

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Quite possily, wildwood. But even if it was one hundreth of that size (0.001mm) it would still contain around 24 million million million atoms (24 followed by 18 noughts). That's why I suggested that the size of the particle was not particularly critical.

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