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Thermodynamic Ethanol Saturation

  1. Jul 27, 2011 #1
    I am try to calibrate an MQ-3 sensor with and Arduino board.

    However, I need a little help with thermodynamics, I am using a container of alcohol which has a volume of 591.470 mL, only 100mL is filled with 100 proof (50%) alcohol. However I need to calibrate the sensor to the content of alcohol in air the container. I need a thermodynamic relation of how much ethanol is saturated in the air when it is fully saturated at room temperature (23C) (assuming 100% dry air). Density of ethanol is 0.789 g/cm^3.

    How can I mathematically calculate how much alcohol is in the air???

    I am familiar with thermodynamic steam saturation tables, yet I have not seen any refrencing ethanol.

    Any help with a formula that I can implement???
  2. jcsd
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