一级相变是指在发生相变时,有体积的变化同时有热量的吸收或释放的相变。例如,在1个大气压0℃的情况下,1 kg质量的冰转变成同温度的水,要吸收79.6 kcal(千卡)的热量,与此同时体积亦收缩。所以,冰与水之间的转换属一级相变。
首页 ... 一级反应 first order reaction 一级相变 first order phase change 依时计量学反应 time dependent stoichiometric reactions ...
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...Classifications of Solid-State Phase Transformation 根据相变时热力学函数的变化:一级相变(First Order Phase Transition): 相变时有体积变化及相变潜热释放的固态相变 物态变化及同素异构二级相变(Second Order PhaseTransition) :相变时无体积变化...
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...大量的挥发导致踪迹不能持续存在)到有序的觅食(以踪迹为基础的觅食),并将其类比为实体系统中的一级相变(first-order transition),比如在达到临界温度时,由水到冰这种不连续的变化。
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... Product of the First Order 一级产品 pyramid of the first order 初级棱锥体 transition of the first order 一级相变 ...
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这个相变在热力学上为一级相变。
观察到一级相变点值变大,二级相变点值变小,反应窗口变宽。
It is observed that the width of the reactive window is broadened, the first critical point becomes larger and the second critical point becomes smaller.
在相变温度区域里,介电、热电和压电都有明显的热滞效应,具有一级相变特性。
Near the transition temperature, a thermal hysteresis was found in dielectric, pyroelectric and piezoelectric measurements. Thus the transition should be of the first order transition.
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