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Related Concept Videos

Uncertainty in Measurement: Reading Instruments02:46

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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Measurement: Standard Units03:38

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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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Measurement is an indispensable part of analytical chemistry. The result of measurement helps quantify a substance's physical property and compare it with the physical property of another substance. Each measurement comprises two components - a number indicating the magnitude and a unit of measurement as a standard for comparison. Further, the same quantity can be measured using different units of measurement, which leads to differences in magnitude.
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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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Related Experiment Video

Updated: Jul 21, 2025

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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[FENO measurement devices].

Marina Blanco-Aparicio1, Francisco Javier González-Barcala2, Alicia Padilla Galo3

  • 1Servicio de Neumología, Hospital Universitario A Coruña, A Coruña, España.

Open Respiratory Archives
|July 27, 2023
PubMed
Summary

Fraction of exhaled nitric oxide (FeNO) devices aid asthma diagnosis and treatment monitoring. This review compares common devices and analyzes evidence to guide professional selection for optimal patient care.

Keywords:
ChemiluminescenceElectrochemicalFENONitric oxide

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Area of Science:

  • Pulmonology and Respiratory Medicine
  • Medical Device Technology

Context:

  • Exhaled nitric oxide (FeNO) measurements are crucial for asthma management, as recommended by clinical guidelines.
  • A growing number of FeNO devices are available, presenting a challenge for healthcare professionals.
  • Choosing the right device impacts diagnosis, treatment response prediction, and exacerbation risk assessment.

Purpose:

  • To review the key characteristics of commonly available FeNO devices.
  • To analyze existing comparative and pharmacoeconomic studies on FeNO devices.
  • To provide evidence-based guidance for selecting appropriate FeNO measurement devices for asthma care.

Summary:

  • This review details the features of popular FeNO devices used in asthma management.
  • It synthesizes findings from comparative studies and economic analyses of these devices.
  • The information aims to assist healthcare professionals in making informed device choices.

Impact:

  • Facilitates informed selection of FeNO devices, potentially improving asthma diagnosis and management.
  • Supports evidence-based decision-making for healthcare providers and institutions.
  • Contributes to optimizing patient care by ensuring appropriate use of technology.