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Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

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,...
Temperature Measurement Sites01:14

Temperature Measurement Sites

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...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

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...
Thermometers and Temperature Scales01:22

Thermometers and Temperature Scales

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...
Assessing Body Temperature - Rectal01:27

Assessing Body Temperature - Rectal

Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...

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Related Experiment Video

Updated: Jul 2, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Temperature-compensated induction extensometer.

A R Yazdi1, W E Deeds, C V Dodd

  • 1Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.

The Review of Scientific Instruments
|December 1, 1978
PubMed
Summary

A novel induction extensometer accurately measures linear displacement up to 150 mm. This temperature-compensated transducer minimizes errors across a wide 0-1000°C range, ensuring reliable measurements in demanding environments.

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Last Updated: Jul 2, 2026

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Area of Science:

  • Instrumentation and Measurement
  • Materials Science
  • Physics

Background:

  • Accurate linear displacement measurement is crucial in various scientific and industrial applications.
  • Conventional extensometers often suffer from temperature-induced errors, limiting their use in high-temperature environments.
  • Developing robust transducers with enhanced thermal stability is an ongoing challenge.

Purpose of the Study:

  • To design and construct a linear displacement transducer (extensometer) with a 0-150 mm range.
  • To achieve high accuracy by minimizing temperature-related errors from 0 to 1000°C.
  • To demonstrate the adaptability of the design for different displacement and temperature ranges.

Main Methods:

  • The transducer utilizes electromagnetic induction with a bifilar coil and coaxial conducting cylinders.
  • The design incorporates specific features for temperature compensation to counteract thermal expansion effects.
  • Experimental measurements were conducted to validate the transducer's accuracy and temperature stability.

Main Results:

  • The induction extensometer successfully measures displacements up to 150 mm.
  • Experimental data shows a minimal error of 1 mm over the 150 mm range for a 500°C temperature change.
  • The design is scalable for displacement ranges from 2.5 mm to 250 mm and adaptable to various temperature ranges.

Conclusions:

  • The developed induction extensometer offers a reliable solution for accurate linear displacement measurement in high-temperature conditions.
  • The transducer's temperature compensation mechanism effectively minimizes errors, enhancing measurement precision.
  • The scalable and adaptable design holds potential for diverse applications requiring precise displacement sensing.