The number of particles in something depend upon what that substance is. A cm is simply a measurement in one dimension only and, by itself, does not tell us enough information to answer how many particles there are.
If, for example, you asked how many particles are there in 1cm3 of uranium then an answer could be provided.
As this question is posted under maths and not physics, it could be that you have used the word "particles" incorrectly. A cm is equal to 10mm if that is what you wish to know.
Sandstone is made from .05 cm particles.
A rock made of particles that are 0.05 cm in size would likely be classified as a fine-grained sedimentary rock. These rocks are formed from the accumulation and lithification of sediment particles that are typically smaller than 0.0625 mm in diameter. Examples include mudstone, siltstone, and shale.
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To prevent particles of 0.01 cm from settling downstream, a minimum stream velocity of 0.02 m/s is required, based on Stokes' law calculations for settling velocity.
1
12.6 cm is about 4.96 cm
... particles.... particles.... particles.... particles.
1,738,000 cm
4.6
53.34 cm
5 cm