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Related Concept Videos

Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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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.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
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Thermosensation01:43

Thermosensation

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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...
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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

1.3K
Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
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Fabrication and Testing of Photonic Thermometers
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Advances in thermometry.

Michael R Moldover1, Weston L Tew1, Howard W Yoon1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Nature Physics
|May 17, 2016
PubMed
Summary
This summary is machine-generated.

Significant advancements in thermometry over 25 years have identified errors in the International Temperature Scale of 1990. This progress is paving the way for a kelvin redefinition.

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Area of Science:

  • Thermodynamics and Metrology
  • Physical Sciences

Background:

  • Thermometry has seen substantial progress in the moderate temperature range (1 K to 1235 K) over the past 25 years.
  • This period has been marked by the development and application of various primary thermometers.

Purpose of the Study:

  • To highlight the advancements in thermometry.
  • To discuss the identification of errors in the International Temperature Scale of 1990 (ITS-90).
  • To underscore the impact of these findings on the planned redefinition of the kelvin.

Main Methods:

  • Utilized diverse primary thermometers based on distinct physical principles.
  • Compared thermometer readings against established temperature scales.
  • Analyzed discrepancies to identify inaccuracies in the ITS-90.

Main Results:

  • Uncovered significant errors within the International Temperature Scale of 1990.
  • Demonstrated the capability of new primary thermometers to achieve higher accuracy.
  • Established a foundation for a more precise temperature scale.

Conclusions:

  • Progress in thermometry has revealed limitations of the current ITS-90.
  • Primary thermometers are crucial for accurate temperature measurements.
  • These findings are essential for the successful redefinition of the kelvin.