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The flash point of pure ethanol is 13 °C (55 °F), [89] but may be influenced very slightly by atmospheric composition such as pressure and humidity. Ethanol mixtures can ignite below average room temperature. Ethanol is considered a flammable liquid (Class 3 Hazardous Material) in concentrations above 2.35% by mass (3.0% by volume; 6 proof).
Ethanol vapor pressure vs. temperature. Uses formula = + [10] Log 10 of ... Excess volume of the mixture of ethanol and water (volume contraction)
If an alcohol thermometer utilizes a combination of ethanol, toluene, and pentane, its lower temperature range may be extended to measure temperatures down to as low as −200 °C (−328 °F). [3] However, the measurement temperature range c. −200 °C to 78 °C, is highly dependent upon the type of alcohol used.
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%). B Calculated values *Derived data by calculation.
Volume fraction, which is widely used in chemistry (commonly denoted as v/v), is defined as the volume of a particular component divided by the sum of all components in the mixture when they are measured separately. For example, to make 100 mL of 50% alc/vol ethanol solution, water would be added to 50 mL of ethanol to make up exactly 100 mL.
Unlike traditional cocktails made that use a spirit as a base, most nonalcoholic drinks are water-based or contain a high quantity of water through ingredients like fruit juices or teas.
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The subject's body temperature and breath temperature also influence results, with an increase in temperature corresponding to an increase in measured BrAC. [ 25 ] [ 18 ] Furthermore, the humidity and temperature of the ambient air can decrease results by as much as 10%. [ 27 ]