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Related Concept Videos

Pressure and Volume in an Adiabatic Process01:27

Pressure and Volume in an Adiabatic Process

Free expansion of a gas is an adiabatic process. However, there are few differences between free expansion and adiabatic expansion. During free expansion, no work is done, and there is no change in internal energy. But, for an adiabatic expansion, work is done, and there is a change in internal energy. During an adiabatic process, the relation between the pressure and volume is obtained from the condition for the adiabatic process, that is,
Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
Physical Principles Governing Gas Exchange01:16

Physical Principles Governing Gas Exchange

Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
Gas Laws Governing Respiration
The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law.
Dalton's Law asserts that the total pressure exerted by...
The Kinetic Model of Gases01:24

The Kinetic Model of Gases

The kinetic model of gases explains the properties of a perfect gas using three main assumptions: molecules move in ceaseless random motion, their size is negligible compared to the distances between them, and they do not interact except during perfectly elastic collisions. The total energy of a gas is the sum of the kinetic energies of all its constituent molecules. The pressure exerted by the gas arises from the continual bombardment of the container walls by billions of colliding molecules.
Work Done in an Adiabatic Process01:20

Work Done in an Adiabatic Process

Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
Energy Diagrams - I01:14

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the interpretation of the dynamics of the system becomes even simpler.
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Perspective: Nonadiabatic dynamics theory.

John C Tully1

  • 1Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA.

The Journal of Chemical Physics
|December 20, 2012
PubMed
Summary
This summary is machine-generated.

Understanding nonadiabatic dynamics, where nuclear motion spans multiple potential energy surfaces, is crucial. Further development of predictive theories is urgently needed for applications in solar energy, photochemistry, and beyond.

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Area of Science:

  • * Focuses on the complex field of nonadiabatic dynamics, crucial for understanding chemical transformations.
  • * Highlights the interplay between nuclear motion and multiple potential energy surfaces in chemical reactions.

Background:

  • * Nonadiabatic dynamics has been a long-standing area of interest in chemistry.
  • * Recent experimental and theoretical advances have improved understanding of nonadiabatic chemical transformations.

Discussion:

  • * Addresses the urgent need for more practical and predictive theories in nonadiabatic dynamics.
  • * Identifies significant theoretical and computational challenges hindering progress.

Key Insights:

  • * Emphasizes the critical role of nonadiabatic dynamics in diverse scientific fields.
  • * Discusses the limitations of current theoretical models in predicting reaction pathways.

Outlook:

  • * Proposes potential strategies to overcome existing theoretical and computational obstacles.
  • * Suggests future research directions for advancing the field of nonadiabatic dynamics.