CH 304K 1st Edition Lecture 4 Outline of Last Lecture I. Atmospheric Pollutants and Risk AssessmentOutline of Current Lecture II. Shortcomings of Risk AssessmentIII. AtmosphereIV. Temperature ScalesV. PressureVI. Mixtures vs. pure substancesCurrent LectureShortcomings of Risk Assessment- Exposure limits are an educated “best guess” (scientists can’t actually test exposure of toxins on humans…)- The sensitivity of individual varies- Some people are more ok with higher levels or risk than othersEPA- Formed in 1970- Sets air quality standards based on risk assessment data- 1970 Clean Air Act- 1990 Pollution Prevention ActAtmosphere- 3 main regions: Troposphere, Stratosphere, MesosphereTemperature Scales- Celcius, Fahrenheit, KelvinThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Water boils at 100 degrees C, 212 degrees F, or 373.15 K- Water freezes at 0 degrees C, 32 degrees F, 273.15 KPressure- Force per unit area- Pascals= N/m2- Atmospheric pressure: weather changes local atmospheric pressure- Thermal inversions: traps pollution in low lying areasMixtures- Can be separated into pure substances using physical methods- Can be concocted with varying results- Solvent dissolves the solutePure Substance- Cannot be separated by physical methods- Fixed composition- If it can be separated by chemical methods it is a
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