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Why is it that the short ones are often the most tricky?

8dn Constant part of the family. (3)

K _ N

Presumably this must be KIN (= family). But what's it got to do with 'constant'??

I've seen the 'K Constant' referred to a few ways in the past day.

Boltzmann constant , Kelvin and also part of Coulomb's law.

Don't know which is correct.

sorry

K + in (part of)

Thank you mamya, I guess that must be it. Not great though is it?

Not really, unless I'm missing something else.