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Related Concept Videos

Vaporization01:18

Vaporization

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The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Gas Exchange and Transport01:20

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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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The Respiratory System01:16

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The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.
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Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision

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The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
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The Carbon Cycle01:14

The Carbon Cycle

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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Updated: Sep 13, 2025

Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
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Editorial for the Special Issue "Editorial Board Members' Collection Series: Aerosol Particles".

Matthias Karl1, Yuan Cheng2

  • 1Department of Coastal Environmental Chemistry, Helmholtz Zentrum Hereon, 21502 Geesthacht, Germany.

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Aerosol particles are crucial for sustainable cities, clean energy, and climate change mitigation. Understanding these particles aids in developing solutions for global environmental challenges.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Urban Planning

Background:

  • Aerosol particles significantly influence environmental processes.
  • Their impact spans sustainable city development, energy production, and climate change.
  • Addressing societal challenges requires a deep understanding of aerosol science.

Discussion:

  • Aerosol particles are integral to sustainable urban development.
  • They are key factors in clean energy production technologies.
  • Mitigating climate change necessitates comprehensive aerosol research.

Key Insights:

  • Aerosol particles are central to addressing major global issues.
  • Their role in sustainable cities and clean energy is significant.
  • Effective climate change strategies depend on aerosol particle knowledge.

Outlook:

  • Further research into aerosol particle behavior is essential.
  • This knowledge will drive innovation in sustainable technologies.
  • Aerosol science offers pathways to tackle pressing environmental concerns.