ericmazur / PnPbook

Tracking of typos, errors, and improvements for "The Principles and Practice of Physics"
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per unit length #211

Open JohnDenker opened 7 years ago

JohnDenker commented 7 years ago

In the appendix on page A-7 it says "windings per unit length" is unitless.

It can't be unitless. What's more, it can't even be dimensionless.

It has dimensions of inverse length, and the SI unit is m^-1.

This is particularly obvious considering that the previous item is "objects per unit volume", measured in m^-3.

See also item #50 (units versus dimensions).