Adding zero-weight books?

I'm kind of a completist, and I am bothered by any lacunae in my book cataloging data. During the pandemic I filled one of my largest lacunae by weighing and measuring all my books, and now I've got nearly all of them with measurements. However, I have an ebook I need to catalog (early reviewer giveaway; I need to keep it in my library) and it obviously has zero weight and dimensions. However, I've discovered that putting zeros in those fields means that when I save, it becomes blank. Any way to indicate that that book fills zero width on my shelf, adds zero height to my book stack, and adds zero weight to my books?

Add a decimal. When I tried it, "0.00" stayed visible in the book details instead of disappearing.

I add all my e-books as 0.001 inch cubes that weigh 0.001 lbs. It's nice to know that I could use 0.00!

Okay, you got me curious: apparently the average ebook stored in magnetic memory weighs about .000000000001 grams, although it depends on how many 1s vs. how many 0s are in it, because 1s are heavier.

I don't think you can get a meaningful volume measure, though...

Hi >melannen,

The obvious question, why the difference in weight?

well according to the quick google I just did and my vague memories of college physics, the magnetism that records the the ones and zeros is basically made by changing what electrons are up to. But because tiny physics is weird, changing the state of an electron actually involves a teeny-tiny amount of mass/energy (at this scale they're kinda the same thing) either leaving or entering the atom via things like photons. So every time a bit flips, the mass changes by an extremely tiny amount of mass.

I assume the "weight of data" numbers I used are based on the idea that if there was no data being stored, the electrons would all be in their lowest-mass state (which may or may not be correct) so the weight given for a bit is the difference between a bit in its highest-mass state and its lowest-mass state. The bit-state that's read as 1 is usually the higher-mass state. (I took the number of bits in an average kindle book * the weight given for a bit / 2. Very approximately.)

That could, however, all be entirely bullshit.