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Subject: Re: Measuring/Weighing Bottles
From: Dan the Melon Man
Posted: Tue Jan 24. 2006, 23:15 UTC
Followup to: "Re: Measuring/Weighing Bottles"  by Natrone  (Tue Jan 24. 2006, 22:55 UTC)
FTR, The technical term for the empty container weight is 'tare weight' (most 
often seen in trucking logs I reckon).

I still haven't seen a published chart for liquor (anyone want to volunteer?) 
. The only half-useful search results were all advertising beverage control 
systems, which is fair enough.
[Dan the Melon Man] Re: Liquor Bottle Tare Weights

I suggest that if you don't know the tare weight yet, you can get equally 
accurate results by reversing the math for a full, or even half-full bottle 
and calculating the difference between beginning and end of a shift.

Beginning of shift, a part-full, 1 litre bottle weighs 670g

End of shift, the bottle has been replaced once, and the new (part-used) 
bottle weighs 930g

We assume that 1 litre of liquor weighs 1000g (close enough)

Count the (content of the) newly opened bottle(s) as part of your start stock, 
(+1000g) and we can say we :
- started with a weight of 1670g  (1 bottle+?liquor)
- and ended with a weight of 930g (1 bottle+?liquor)
-> Hence we've dispensed 740g (est 740ml) of product

Divide that down into shots of whatever size yourself!

There is a bit of trickery going on here as I account for the weight of the 
current bottle by pretending it doesn't exist :-B BUT I think the maths is 
sound, and you can check the figures by making up any size bottle weight and 
running the calculations again.

B(ottle) = ?
L(iquor) = ? (1:start 2:finish)
N(ew Bottle volume) = 1000

B+L1+N = 1670
B+L2+N = 930

  B+L1+N - B+L2+N = 1670 - 930 = 740
=     L1 - L2     = 740

Note, we still don't know exactly how much stock you have on hand! Only how 
much stock has been used between these to points in time.

.dan.


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