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Vapor Pressure02:34

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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A Flexible and Highly Sensitive Inductive Pressure Sensor Array Based on Ferrite Films.

Xinran Tang1, Yihui Miao2, Xinjian Chen3,4

  • 1School of Electronic and Information Engineering, Soochow University, Suzhou 215006, China. 20165228032@stu.suda.edu.cn.

Sensors (Basel, Switzerland)
|May 30, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel flexible inductive pressure sensor array for health monitoring and wearable electronics. This low-cost, highly sensitive device offers a simple construction and demonstrates excellent stability and fast response times.

Keywords:
flexible electronicsinductive sensingpressure sensor arraywearable device

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Growing demand for sensitive, adaptable, low-cost pressure sensors in health monitoring, wearable electronics, and home care.
  • Need for large-area contact pressure measurement solutions.

Purpose of the Study:

  • To report a novel flexible inductive pressure sensor array with ultrahigh sensitivity and simple construction.
  • To enable large-area contact pressure measurements for various applications.

Main Methods:

  • Fabrication of a three-layer device: planar spiral inductor, ferrite film on a polyethylene terephthalate (PET) membrane, separated by elastic pillars.
  • Utilizing the magnetic permeability of the ferrite film to influence inductance based on separation distance changes.
  • Characterization of sensitivity, resolution, stability, response time, and repeatability.

Main Results:

  • Achieved ultrahigh sensitivity of 1.60 kPa⁻¹ and a resolution of 13.61 Pa in the 0-0.18 kPa range.
  • Demonstrated outstanding stability against electrical noise (0.08% variation) and long-term pressure load (0.3% variation over 32 h).
  • Exhibited a fast response time of 111 ms and good repeatability.

Conclusions:

  • The developed flexible inductive pressure sensor array offers a promising solution for high-performance, large-area pressure sensing.
  • The device's stability, sensitivity, and fast response make it suitable for health monitoring and wearable electronic applications.
  • A 4x4 sensor array was successfully integrated into a wearable keyboard for a smart electronic calendar, showcasing practical utility.