But when smoke goes in, it will make the light scatter a different way, or block the light in a certain way, and that will change the amount of current that's flowing If it is tuned correctly, you can interpret that change in current as the presence of smoke
The system must guarantee compliance with regional and national emission limits, be subject to regular inspections, and be equipped with effective monitoring systems.
They also looked at people who used nicotine replacement therapy (NRT), which is commonly used to help people stop smoking or as a long-term alternative
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10 May 2012