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Related Concept Videos

Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
Volatilization01:10

Volatilization

Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
Other Factors Affecting Respiration Centers01:17

Other Factors Affecting Respiration Centers

Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical level,...
Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...

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Related Experiment Video

Updated: Jul 2, 2026

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

[Indoor volatile organic compounds: concentrations, sources, variation factors].

A Palot1, C Charpin-Kadouch, J Ercoli

  • 1Service de pneumologie-allergologie, Hôpital Nord, Marseille et EA1784 IFR 112, Université de la Méditerranée, France.

Revue Des Maladies Respiratoires
|September 6, 2008
PubMed
Summary

Indoor air pollution from volatile organic compounds (VOCs) is a significant concern, with levels often much higher inside homes than outdoors. Monitoring and regulating these indoor VOC sources are crucial for public health.

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Last Updated: Jul 2, 2026

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber
09:46

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber

Published on: November 18, 2018

Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor
13:29

Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor

Published on: December 15, 2018

Area of Science:

  • Environmental Science
  • Public Health
  • Indoor Air Quality

Background:

  • Volatile organic compounds (VOCs) contribute to urban air pollution and are prevalent indoors from household products.
  • Indoor VOC concentrations can be significantly higher than outdoor levels, with up to 25% of French homes exhibiting high concentrations.
  • Factors influencing indoor VOC levels include product composition, ventilation rates, and household characteristics like temperature, humidity, and building age.

Purpose of the Study:

  • To highlight the prevalence and sources of indoor volatile organic compounds (VOCs).
  • To emphasize the need for better monitoring and regulation of indoor air pollutants.
  • To inform the public about their role in maintaining indoor air quality.

Main Methods:

  • Analysis of national survey data on indoor air quality.
  • Identification of common household sources of VOCs.
  • Review of factors affecting indoor VOC concentrations.

Main Results:

  • Indoor VOC levels are substantially higher than outdoor levels.
  • A significant percentage of homes have elevated VOC concentrations, primarily from indoor sources like cleaning and decorating products.
  • Aldehydes are common VOCs found in everyday products.

Conclusions:

  • Volatile organic compounds (VOCs) are a component of daily air pollution.
  • Enhanced monitoring of VOC sources and concentrations is necessary.
  • Public engagement and improved regulatory measures are essential for managing indoor air quality.