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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer I01:14

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Conduction, Convection and Radiation: Problem Solving01:20

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Updated: Oct 11, 2025

Evolution of Staircase Structures in Diffusive Convection
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Diffusion and convection in nature.

Alberto Vailati1, Shenghua Xu2, Stefano Aime3

  • 1Dipartimento di Fisica 'Aldo Pontremoli', Università degli Studi di Milano, Milan, Italy.

The European Physical Journal. E, Soft Matter
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Summary
This summary is machine-generated.

This topical issue explores diffusion and convection phenomena in natural systems. It highlights key processes driving transport in diverse environments.

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Area of Science:

  • Environmental Science
  • Geophysics
  • Fluid Dynamics

Background:

  • Focuses on the fundamental processes of diffusion and convection.
  • Examines their roles in various natural phenomena, from atmospheric to oceanic systems.

Discussion:

  • Investigates the interplay between diffusion and convection in shaping natural patterns.
  • Discusses modeling approaches and observational techniques used to study these processes.

Key Insights:

  • Highlights the critical importance of transport phenomena in Earth systems.
  • Presents novel findings on the dynamics of diffusion and convection in diverse natural settings.

Outlook:

  • Suggests future research directions in understanding complex transport mechanisms.
  • Emphasizes the need for integrated approaches combining theory, modeling, and empirical data.