<Table> ISO 14688 - 1: 2002 <Tr> <Th_colspan="4"> Name </Th> <Th> Size range (mm) </Th> <Th> Size range (approx. in) </Th> </Tr> <Tr> <Td_colspan="2"> Very coarse soil </Td> <Td> Large boulder </Td> <Td> LBo </Td> <Td>> 630 </Td> <Td>> 24.8031 </Td> </Tr> <Tr> <Td> Boulder </Td> <Td> Bo </Td> <Td> 200--630 </Td> <Td> 7.8740--24.803 </Td> </Tr> <Tr> <Td> Cobble </Td> <Td> Co </Td> <Td> 63--200 </Td> <Td> 2.4803--7.8740 </Td> </Tr> <Tr> <Td> Coarse soil </Td> <Td> Gravel </Td> <Td> Coarse gravel </Td> <Td> CGr </Td> <Td> 20--63 </Td> <Td> 0.78740--2.4803 </Td> </Tr> <Tr> <Td> Medium gravel </Td> <Td> MGr </Td> <Td> 6.3--20 </Td> <Td> 0.24803--0.78740 </Td> </Tr> <Tr> <Td> Fine gravel </Td> <Td> FGr </Td> <Td> 2.0--6.3 </Td> <Td> 0.078740--0.24803 </Td> </Tr> <Tr> <Td> Sand </Td> <Td> Coarse sand </Td> <Td> CSa </Td> <Td> 0.63--2.0 </Td> <Td> 0.024803--0.078740 </Td> </Tr> <Tr> <Td> Medium sand </Td> <Td> MSa </Td> <Td> 0.2--0.63 </Td> <Td> 0.0078740--0.024803 </Td> </Tr> <Tr> <Td> Fine sand </Td> <Td> FSa </Td> <Td> 0.063--0.2 </Td> <Td> 0.0024803--0.0078740 </Td> </Tr> <Tr> <Td> Fine soil </Td> <Td> Silt </Td> <Td> Coarse silt </Td> <Td> CSi </Td> <Td> 0.02--0.063 </Td> <Td> 0.00078740--0.0024803 </Td> </Tr> <Tr> <Td> Medium silt </Td> <Td> MSi </Td> <Td> 0.0063--0.02 </Td> <Td> 0.00024803--0.00078740 </Td> </Tr> <Tr> <Td> Fine silt </Td> <Td> FSi </Td> <Td> 0.002--0.0063 </Td> <Td> 0.000078740--0.00024803 </Td> </Tr> <Tr> <Td_colspan="2"> Clay </Td> <Td> Cl </Td> <Td> ≤ 0.002 </Td> <Td> ≤ 0.000078740 </Td> </Tr> </Table> <Tr> <Th_colspan="4"> Name </Th> <Th> Size range (mm) </Th> <Th> Size range (approx. in) </Th> </Tr> <Tr> <Td_colspan="2"> Very coarse soil </Td> <Td> Large boulder </Td> <Td> LBo </Td> <Td>> 630 </Td> <Td>> 24.8031 </Td> </Tr> <Tr> <Td> Boulder </Td> <Td> Bo </Td> <Td> 200--630 </Td> <Td> 7.8740--24.803 </Td> </Tr>

A clay particle is small. what are the limits of the size of this particle