Question

Why the specific gravity has poor Repeatblity

Answer 1

Answer:

Specific gravity has no units because all the units cancel out in its formula. The formula for the specific gravity of an object is its density...

Answer 2

heya mate !

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method employing density meter for the determination of specific gravity (SG) has been tested

for the determination of the gravity (G) of beer, aqueous sugar solutions and aqueous ethanol

solutions by the Analysis Committee of the Institute of Brewing. The term "gravity", used throughout

this report is defined by the equation SG 1000. Repeatability (rgg) and reproducibility (RgB) values

were calculated over the range 994.6 to 1124.2 gravity. For beer, it was judged that precision values

were independent of the gravity of the sample. Values for r^ and RgB were 0.1 and 0.9, respectively,

for instruments with a 5 figure display and 0.08 and 0.32, respectively, for instruments with

figure display, over the range 999.1 to 1017.0 gravity. For solutions of ethanol in water, precision was

also independent of the gravity of the sample. Values for r^ and R0B were 0.1 and 0.3, respectively,

for instruments with figure display and 0.05 and 0.19, respectively, for instruments with

figure display, over the range 994.6 to 999.1 gravity. For aqueous sugar solutions the values of r98 and

Rgg increased with increasing gravity. At 1049.3 gravity, values for rSB and R9S were 0.1 and 0.8,

respectively, for instruments with figure display and 0.07 and 0.35, respectively, for instruments

with figure display. At 1124.2 gravity values for r8B and R9B were 0.2 and 1.4, respectively, for

instruments with a figure display and 0.16 and 1.35, respectively, for instruments with figure

display.

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I hope it helps.