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Spectroscopic ethanol is an absolute ethanol with a low absorbance in ultraviolet and visible light, fit for use as a solvent in ultraviolet-visible spectroscopy. [125] Pure ethanol is classed as 200 proof in the US, equivalent to 175 degrees proof in the UK system. [ 126 ]
Alcohol proof (usually termed simply "proof" in relation to a beverage) is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in England and from 1816 was equal to about 1.75 times the percentage of alcohol by volume (ABV).
Phase behavior Triple point: 150 K (−123 °C), 0.00043 Pa Critical point: 514 K (241 °C), 63 bar Std enthalpy change of fusion, Δ fus H o +4.9 kJ/mol
In the United Kingdom, proof is 1.75 times the number (expressed as a percentage). [23] [20] For example, 40% alc/vol is 80 proof in the US and 70 proof in the UK. However, since 1980, alcohol proof in the UK has been replaced by alc/vol as a measure of alcohol content, avoiding confusion between the UK and US proof standards. [citation needed]
Solvent Density (g cm-3) Boiling point (°C) K b (°C⋅kg/mol) ... Ethanol: 0.78 78.4 1.22 –114.6 –1.99 K b [2] Ethylene bromide: 2.18 133 6.43 9.974 –12.5 K b ...
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