Phase Angle
Phase Angle - Related Videos
01:13
Contact Angle
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2023
When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces. The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
02:39
Phase Diagrams
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2020
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
05:16
Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure
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Cited by 1 •
2025
This protocol presents R codes for performing restricted cubic spline multivariable Cox regression analysis to determine the cutoff value of the phase angle for prognosis in acute heart failure as well as codes for calculating statistics that measure the discriminatory ability of each model and evaluate its goodness of fit.
02:31
Phase Transitions
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2020
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 occupy...
04:05
Clinical Application of Phase Angle and BIVA Z-Score Analyses in Patients Admitted to an Emergency Department with Acute Heart Failure
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Cited by 10 •
2023
In this protocol, we explain how to obtain and interpret phase angle values and bioelectrical impedance vectorial analysis (BIVA) Z-score obtained by bioelectrical impedance in patients with acute heart failure admitted to the Emergency Department and their clinical applicability as a predictive marker for the prognosis of a 90-day event.
FAQs
For two periodic signals, the same time delay produces a phase shift that depends on angular frequency: faster oscillations accumulate a larger angular offset over that delay. The comparison can also be spatial when wave patterns are shifted along position. Thus, phase angle links an observable timing or spatial displacement to the waveform’s location within its cycle.
Leading means one waveform reaches a corresponding point in its cycle earlier than the reference, while lagging means it reaches that point later. These terms communicate the direction of the displacement, not simply its size. That distinction helps interpret timing between oscillations and identify relationships relevant to interference, harmonic motion, and alternating-current behavior.
Resistance, inductance, and capacitance can change the relative timing between alternating-current voltage and current, creating a measurable phase offset. The angle therefore provides information about how the circuit’s components affect that relationship. Comparing voltage and current phase helps identify whether the signals are aligned or whether one leads or lags, with implications for interpreting power transfer.
Phase angle gives a common way to compare oscillations that may not reach corresponding points at the same time. In wave interference, it characterizes the relative waveform positions; in harmonic motion, it tracks how one oscillation is shifted from another. This comparison clarifies signal relationships and timing without relying only on the existence of periodic motion.
Select one waveform as the reference and compare a corresponding feature on the second waveform, such as its position in the cycle. Measure the time or spatial displacement between them, then relate that displacement to the full cycle and report the result in degrees or radians. Keeping the same reference makes comparisons between waveform pairs consistent.
In an alternating-current circuit, examine the phase relationship between voltage and current rather than either waveform alone. If their corresponding points coincide, they are in phase; if one is shifted, identify which leads and which lags. This reading connects the component-dependent offset between voltage and current with analysis of power transfer.
Phase angle analysis is useful wherever timing or position within repeating signals matters. In physics, it supports interpretation of wave interference and harmonic motion; in engineering contexts, it informs alternating-current, optical, and communication-system analysis. It can reveal signal timing relationships and help guide system design involving oscillations, electrical behavior, or transmitted waveforms.