Physics

Physics, 20.07.2019 14:10, morganlynn18

Write three characteristics of particulate of natuere of matter

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Chemistry, 13.07.2019 00:20, iggysouchet

An office building with constant-volume system has a filter located before the outdoor air intake vent with efficiency of 75% for environmental tobacco smoke (ets). there are 10 occupants, 2 of whom are smokers. data indicates that smoking one cigarette per hour produces between 5 and 10 µg/s of particulate matter pm10. taking the average, a production rate of particulate matter pm10 at 2×7.5 = 15 µg/s can be assumed. the outdoor airflow rate is 20 cfm per person, the supply airflow rate 50 cfm per person, and the return airflow rate 40 cfm per person. the ventilation effectiveness is 0.9. assume that there is no ets outdoors. evaluate the iaq based on air quality standards set by u.s. epa?

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Geography, 29.09.2019 00:20, imantahir1200345

4. identify which of the following cases are in attainment" or "not in attainment" with the epa's standards, explain why. (a) the annual fourth-highest daily maximum for 8-hour concentrations of ozone in denver, colorado was 0.1 ppm, averaged over 2000, 2001 and 2002 years. (b) the 98th percentile of daily concentrations of particulate matter less than 2.5 micron in baltimore city, maryland were 39 ug m averaged over 2015, 2016 and 2017. (c) the annual concentrations of particulate matter less than 2.5 micron in orlando, florida were 12, 13 and 14 ug m'in 2016, 2017 and 2018, respectively. (d) the daily mean concentrations of particulate matter less than 10 micron in daytona beach, florida were 155 ug m and 156 ug m in 2017 and 2018, respectively. (e) the yearly average concentrations of nitrogen dioxide in san diego, california were 50 ppb in 2018.

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Chemistry, 10.10.2019 05:00, vlactawhalm29

Aparticulate matter sampler was operated for 24 hours at a flowrate of 1.4 m3 min-1. the starting weight of the filter paper before sampling was 2.05 grams. at the end of the sampling period, the filter's weight was 3.84 grams, and the gain in weight was due completely to the particulate matter that had collected on the surface of the filter paper during air sampling. determine the particulate matter concentration, in micrograms per cubic meter (expressed to one decimal place), for the given sampling time.

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Geography, 10.10.2019 20:00, Kelshonti15

1. write the definition of particulate matter and its 3 classifications depending on the sizes. 2. categorize air pollutants according to the phase and source(human activity) and then write 3 examples for each category. 3. write famous 5 primary and 2 secondary air pollutants. compare the two famous smog disasters in 5 characteristics

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