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Related Concept Videos

Temperature Measurement Sites01:14

Temperature Measurement Sites

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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
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Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...
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The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
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The Number e as a Limit

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The number e is a fundamental constant in calculus, playing a central role in describing continuous change, particularly exponential growth. It is most naturally defined through its relationship with the natural logarithm, which is the inverse of the exponential function with base e. This relationship allows e to be characterized using basic principles of differentiation rather than as an arbitrary numerical constant.A key property of the natural logarithm function, ln x, is that its derivative...
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Globe Temperature and Its Measurement: Requirements and Limitations.

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  • 1ADAI, LAETA, Department of Mechanical Engineering, University of Coimbra, Pólo II, Coimbra, Portugal.

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Globe temperature measurements reveal that standard response times are often too short, requiring longer observation periods. Sensor diameter and air velocity significantly impact readings, necessitating correction equations for accurate thermal environment assessment.

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WBGTglobe temperatureheat stresswet-bulb globe temperature

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Area of Science:

  • Environmental Science
  • Thermal Physics
  • Metrology

Background:

  • Accurate globe temperature measurement is crucial for assessing thermal environments.
  • Existing literature may underestimate required measurement durations and overlook key influencing factors.

Purpose of the Study:

  • To investigate the response times of globe thermometers.
  • To evaluate the influence of globe diameter and air velocity on temperature measurements.
  • To propose correction equations for standard globe temperature.

Main Methods:

  • Utilized two globe thermometers (50 mm and 150 mm diameters).
  • Conducted tests under various thermal environmental conditions, including different air velocities.
  • Analyzed response times, diameter effects, and air velocity impacts.

Main Results:

  • Response times exceeding 30 minutes were observed in 68% of tests, questioning literature values.
  • Differences greater than 20°C were recorded between the 50 mm and 150 mm sensors.
  • Air velocity variations caused mean relative differences exceeding 30%.

Conclusions:

  • Standard measurement periods for globe thermometers may be insufficient.
  • Globe diameter significantly affects temperature readings, with smaller globes showing greater sensitivity.
  • Correction equations based on 50 mm globe measurements are proposed for natural and forced convection scenarios.