Air Temperature Measurement
Air Temperature Measurement - Related Videos
01:14
Temperature Measurement Sites
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2024
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...
01:23
Measurement of Air Content in Concrete
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2024
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions. The pressure method,...
09:50
Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
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Cited by 4 •
2017
A protocol for determining the vitreous phase densities of micro- to pico-liter size drops of aqueous mixtures at cryogenic temperatures is described.
01:13
Equipments Used to Measure Body Temperature
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2024
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,...
07:28
Pitot-static Tube: A Device to Measure Air Flow Speed
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2023
Source: David Guo, College of Engineering, Technology, and Aeronautics (CETA), Southern New Hampshire University (SNHU), Manchester, New Hampshire A Pitot-static tube is widely used for measuring unknown speeds in air flow, for example, it is used to measure airplane airspeed. By Bernoulli's principle, airspeed is directly related to variations in pressure. Therefore, the Pitot-static tube senses the stagnation pressure and static pressure. It is connected to a manometer or pressure transducer...
FAQs
A reliable reading requires the sensor’s physical state to match the thermal condition of the air around it. Before equilibrium, the sensor may still reflect its previous environment rather than the atmosphere being observed. Once equilibrium is reached, liquid expansion, thermistor resistance, or thermocouple voltage can be translated into a temperature value that more accurately represents local air conditions.
These instruments detect temperature through different physical responses. A liquid thermometer indicates thermal change through liquid expansion, a thermistor uses a change in electrical resistance, and a thermocouple produces a voltage related to temperature. Their shared purpose is to convert the air’s thermal condition into a readable signal, while their sensing mechanisms determine how the measurement is obtained.
Nearby heat sources and surfaces can influence the sensor, causing its reading to reflect local heating rather than the surrounding air alone. Direct sunlight, for example, can alter the sensor’s thermal condition. Proper placement and shielding reduce these influences, helping the instrument reach a reading that better represents atmospheric conditions at the measurement location.
Begin by positioning the selected instrument where it can interact with the surrounding air, then provide adequate ventilation so the sensor can approach thermal equilibrium. Keep it away from direct sunlight and nearby heat sources, and allow the reading to stabilize before recording it. This setup improves the representativeness of observations used in environmental studies.
Ventilation allows air around the sensor to exchange with the broader local atmosphere, while shielding helps prevent direct sunlight from changing the sensor’s thermal state. Together, these conditions reduce measurement influences unrelated to ambient air. They are especially important when observations will be compared over time or used to characterize weather, climate, or environmental conditions.
Air temperature observations support weather forecasting and climate monitoring by documenting atmospheric conditions. They also provide important information for ecological studies, agriculture, building design, and assessments of heat-related environmental risks. In each case, careful measurement placement and protection help ensure that the data describe the surrounding environment rather than a localized influence from equipment or nearby surfaces.