IS 2302 : 1989 Tables for alcoholometry by hydrometer method

1 Scope

1.1 This standard covers method of obtaining volumetric contentof ethanol at 20ºC and at 15ºC and 15.56ºC in an alcoholic solution (ethanol-water)using the centesimal hydrometers calibrated at 20ºC.

1.1.1 Table 1 gives alcohol-richness data, that is, ethanolcontent by volume at 20ºC in the sample at tºC against the observed (hydrometer) degree at 0.1 degree interval at the observed temperature, tºC inthe range 0º to 40ºC. The volumeconversion factor given in this table enables computation of realstrength (20º/20º). Also, thevolume in litres per 100 kg (in air) of the sample at the observeddegree is also incorporated in the same table. Table 2 gives theminor corrections for converting the real strength at theinternational reference temperature to that at 15.56ºC or 15ºC for use in the country untilthe adoption of international reference temperature 20ºC for excise purposes.

Note - The volume in litres per 100 kg (in air) of thealcohol-water sample at the observed degree is computed from the OIML data, giving volume corresponding to 100 kg in vacuum, andapplying the correction for buoyancy, β in air,given by β = mass x air density x (reciprocaldensity of sample- reciprocal density of weights used). For mass =100 kg, air density at 27�C = 0.001 177 g/cm³ and the density of cast iron weights as 7.3 g/cm³ we have β = 0.102 to 0.133 kg fromalcohol strength 0 to 100 percent. The volume corresponding to 100kg (in air) of alcohol-water. samples thereby stands modifiedslightly by 0.1 litre to 100.3-119.8 litres in the range 0 to 88observed degree and by 0.2 litres to 120.3-126.9 litres in therange 89-100 observed degree.

2 References

IS 3608 : Part 1 :1987 Specification for glass alcoholometers:Part 1 Glass alcoholometers without thermometer

IS 3608 : Part 2 :1987 Specification for glass alcoholometers:Part 2 Glass alcoholometers with thermometer