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Phase Transitions02:31

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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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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Phase Transitions: Vaporization and Condensation02:39

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The physical form of a substance changes on 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. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Single Accreditation System for Graduate Medical Education: Transition Update.

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    The American Osteopathic Association and other organizations unified graduate medical education accreditation in 2014. This article reviews policy updates and transition planning for the single accreditation system post-June 2020.

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    Area of Science:

    • Medical Education
    • Accreditation Systems
    • Osteopathic Medicine

    Background:

    • Established in 2014, the single accreditation system aimed to unify graduate medical education in the US.
    • Key organizations involved include the American Osteopathic Association and the Accreditation Council for Graduate Medical Education.

    Purpose of the Study:

    • To detail recent policy enhancements and modifications for the single accreditation system transition.
    • To discuss the ongoing transition planning following the official end of the transition period.

    Main Methods:

    • Review of policy documents and organizational announcements.
    • Analysis of transition planning strategies and outcomes.

    Main Results:

    • Significant policy adjustments were implemented to support the accreditation transition.
    • Transition planning continued beyond the June 30, 2020 deadline.

    Conclusions:

    • The transition to a single accreditation system involved complex policy and planning efforts.
    • Ongoing evaluation and adaptation are crucial for the success of unified graduate medical education accreditation.