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In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1 ⁄ 4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference.
However, I've seen many sites claim that a US size 0 is 11.53mm, not 11.63. I've seen other pages that list it as ring_diameter = 11.54 + 0.83 * ring size, which more closely agrees with the size 0 number. On the other hand, a linear regression of this chart results in 11.634 + .8136 x ring_size. It's all over the place, and the charts don't ...
But with body jewelry, there is a wide variety of possible sizes, and wearers generally want jewelry that is the same size as their piercing site. Some wearers want increasingly larger sizes to deliberately stretch the hole. So that wearers can choose the size they want, there are standards for body jewelry sizes, used by jewelry makers and ...
For the formation of different ring sizes via cyclization of substrates of varying tether length, the order of reaction rates (rate constants k n for the formation of an n-membered ring) is usually k 5 > k 6 > k 3 > k 7 > k 4 as shown below for a series of ω-bromoalkylamines. This somewhat complicated rate trend reflects the interplay of these ...
However, for a real polymerization also the ring strain has to be kept in mind. The ring strain is reduced with increasing ring size and reaches near zero in cyclohexane. This can be illustrated with the fact that oxirane polymerizes readily while oxolane is by far less reactive. A second effect is the ring per unit volume effect.
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