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Classifying Matter by State02:49

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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
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Matter: Pure Substances and Mixtures
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The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
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Source Contributions to Ambient Fine Particulate Matter for Canada.

Jun Meng1, Randall V Martin1,2,3, Chi Li1

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Wildfires, transportation, and residential combustion are the top sources of fine particulate matter (PM2.5) in Canada. Despite low overall concentrations, these sectors significantly impact air quality, with regional variations and a notable decrease in anthropogenic contributions over two decades.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Public Health

Background:

  • Fine particulate matter (PM2.5) is a critical air pollutant linked to adverse health outcomes.
  • Understanding emission sources is vital for effective air quality management strategies.
  • Previous assessments of PM2.5 sectoral contributions in Canada require updated, spatially resolved data.

Purpose of the Study:

  • To quantify the contribution of different emission sectors to population-weighted PM2.5 concentrations in Canada for the year 2013.
  • To investigate the geographical variations in sectoral contributions across different Canadian regions.
  • To analyze long-term trends in anthropogenic PM2.5 contributions.

Main Methods:

  • Utilized the GEOS-Chem chemical transport model to simulate PM2.5 concentrations.
  • Downscaled model outputs using satellite-based PM2.5 data for enhanced spatial resolution.
  • Attributed PM2.5 concentrations to specific emission sectors (wildfires, transportation, residential combustion, etc.) and transboundary sources (USA).

Main Results:

  • In 2013, Canadian sources accounted for over 70% of population-weighted PM2.5, with the contiguous United States contributing 30%.
  • The leading sectoral contributors were wildfires (17%), transportation (16%), and residential combustion (15%).
  • Regional contributions varied significantly: wildfires dominated Northern Canada (59%), while residential combustion was highest in Central Canada (19%). U.S. contributions were highest in Central Canada (33%).
  • Over the past two decades, anthropogenic PM2.5 contributions decreased substantially from 7.1 μg m⁻³ to 3.4 μg m⁻³.

Conclusions:

  • Wildfires, transportation, and residential combustion are the primary drivers of PM2.5 in Canada, with significant regional disparities.
  • Transboundary pollution from the U.S. plays a notable role, particularly in Central Canada.
  • The observed decline in anthropogenic PM2.5 suggests the effectiveness of emission control measures, though wildfires remain a significant challenge.