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Breathalyzer

Breathalyzer. Sally, Xi Eliza, Zhao Joyce, Wei. What is breathalyzer?. A machine?. Drinking?. a device to measure blood alcohol content (BAC) from a breath sample. How can the policemen know the amount of alcohol you have drunk?. Let’s get into internal body to see what happened!.

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Breathalyzer

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  1. Breathalyzer Sally, Xi Eliza, Zhao Joyce, Wei

  2. What is breathalyzer? A machine? Drinking? • a device to measure blood alcohol content (BAC) from a breath sample

  3. How can the policemen know the amount of alcohol you have drunk? Let’s get into internal body to see what happened!

  4. After the alcohol is consumed, it is absorbed into the blood stream from stomach • blood gets into the net capillaries which wrap the alveoli • alveoli is located at the bottom of the lungs • the alcohol substances transfer from blood to alveoli (lung) to breath out as exhalation air

  5. alveolus C2H5OH OUT Capillaries CO2 OUT O2 IN The alcohol concentration in the blood stream The alcohol concentration in the exhaled air Breath alcohol content: the amount of alcohol in the exhaled air

  6. How does it work? What about that machine?

  7. Spectrophotometer

  8. ? Can you cheat on the breathalyzer test

  9. The text book tells us: • Some substances can react with acidic Cr2O72- which are not “beverage alcohol” (C2H5OH)酒精 • Similar reactions: CH3OH methanol 甲醇 (CH3)2CHOH isopropyl alcohol异丙醇 C4H9OH butanol 丁醇 etc.

  10. 20ml Mouthwash Let’s do experiments!! • Fermented bean curd • Chinese Tofu Yes! Yes! 339 126

  11. Garlic 14 No

  12. If you want to trick police Try these food: • Drunk duck • liquor-saturated shrimps, liquor-saturated chicken, and liquor-marinated dry fish. • Liqueur chocolate

  13. The only alcohol which you can have in your blood stream and still be alive is ethanol (C2H5OH).

  14. Thank you!

  15. Reference: • Breathalyzer, Wikipedia, the free encyclopedia, 2 November 2011, Retrieved from http://en.wikipedia.org/wiki/Breathalyzer • How breathalyzer work, Craig Freudenrich, Ph.D, 1988-2011, Howstuffworks, Retrieved from http://electronics.howstuffworks.com/gadgets/automotive/breathalyzer.htm • Breathalyzer Reviews, 2008, Retrieved from http://breathalyzerreviews.org/ • Breath alcohol Testers, 2008, breath-tester, Retrieved from http://www.breath-tester.com/

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