Re: Hydrometer accuracy?

Scott L wrote: 
The Artist Formerly Known as Kap'n Salty wrote:

In a 1.100 sugar solution, we'll barely notice a anything amiss at all.
In a 1.050 solution, however, rather than sinking 50 mm we'll only sink
40mm, giving us a reading 10 sg points too high. In a solution of 1.000
(water, say), we'll only sink 80mm rather than the full 100, giving us a
reading of 1.020, or 20 sg points to high.



But this is exactly what "linear error" means. The relationship between
the true gravity and the error is linear. If it were off by a constant
amount, it would be a constant error.

So when you said "non-linear error" I tried to imagine something more
complex than either of those.

That would be why I corrected myself in a subsequent post (as well as the post to which you're replying). Substitute "constant" for "linear".

My post was in response to KGBs assertion that implied that the measurement error would be constant -- it often isn't when the buoyancy has been screwed up by the manufacturer (although, of course, the error in buoyancy IS constant).

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