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Date: 22-11-2020
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Date: 11-7-2018
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Date: 11-6-2019
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Chemists tend to work mostly in the moderately-small part of the distance range. Those who live in the lilliputian world of crystal- and molecular structures and atomic radii find the picometer a convenient currency, but one still sees the older non-SI unit called the Ångstrom used in this context; 1Å = 10–10 m = 100pm. Nanotechnology, the rage of the present era, also resides in this realm. The largest polymeric molecules and colloids define the top end of the particulate range; beyond that, in the normal world of doing things in the lab, the centimeter and occasionally the millimeter commonly rule.
Figure 1.1: Length scales used from atomic to cosmic levels. Note that the numeric scale represents the logarithm of the number shown.
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