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 C 2 H 5 OH OUT CO 2 OUT O 2 IN Capillaries 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?

8. Spectrophotometer

12. Can you cheat on the breathalyzer test

13. The text book tells us: Some substances can react with acidic Cr 2 O 7 2- which are not “beverage alcohol” (C 2 H 5 OH) 酒精 Similar reactions: CH 3 OH methanol 甲醇 (CH3)2CHOH isopropyl alcohol 异丙醇 C 4 H 9 OH butanol 丁醇 etc.

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

15. Garlic 14

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

17. The only alcohol which you can have in your blood stream and still be alive is ethanol ( C 2 H 5 OH).

19. 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/breathal yzer.htm Breathalyzer Reviews, 2008, Retrieved from http://breathalyzerreviews.org/ Breath alcohol Testers, 2008, breath-tester, Retrieved from http://www.breath-tester.com/