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Related Concept Videos

Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

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Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

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Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
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Heating and Cooling Curves02:44

Heating and Cooling Curves

22.9K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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States of Matter and Phase Changes00:59

States of Matter and Phase Changes

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The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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Adaptive multi-temperature control for transport and storage containers enabled by phase-change materials.

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This study introduces an adaptive multi-temperature control system using liquid-solid phase transitions for efficient thermal management. The novel container ensures stable temperatures for transporting sensitive goods like vaccines and food.

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Area of Science:

  • Physical Sciences
  • Engineering
  • Life Sciences

Background:

  • Effective thermal management is crucial for transporting temperature-sensitive items like food and vaccines.
  • Existing phase change material methods face challenges in heat transfer and material properties.

Purpose of the Study:

  • To develop an adaptive multi-temperature control system for enhanced thermal management.
  • To address limitations in current thermal management solutions for essential item transportation.

Main Methods:

  • Utilized liquid-solid phase transitions for adaptive thermal control.
  • Employed a pair of heat and cold sources for temperature regulation.
  • Fabricated a multi-temperature maintenance container using stearic acid and distilled water.

Main Results:

  • Demonstrated highly effective thermal management with minimal temperature fluctuations.
  • Achieved temperature variations of only 0.14-2.05% over a two-hour period.
  • Validated the system's efficacy in maintaining desired temperature ranges.

Conclusions:

  • The developed system offers a practical and effective solution for reliable transportation of essential goods.
  • The liquid-solid phase transition approach shows significant potential for advanced thermal management.
  • Findings have broad implications for various scientific and engineering disciplines requiring precise temperature control.