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Related Concept Videos

Enthalpy02:59

Enthalpy

48.1K
Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum of a system’s internal energy (E) and the mathematical product of its pressure (P) and volume (V):
48.1K
Enthalpy of Solution02:39

Enthalpy of Solution

30.4K
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
30.4K
Enthalpies of Reaction03:33

Enthalpies of Reaction

40.8K
Hess’s law can be used to determine the enthalpy change of any reaction if the corresponding enthalpies of formation of the reactants and products are available. The main reaction may be divided into stepwise reactions : (i) decompositions of the reactants into their component elements, for which the enthalpy changes are proportional to the negative of the enthalpies of formation of the reactants, −ΔHf°(reactants), followed by (ii) re-combinations of the elements (obtained in step 1) to...
40.8K
Standard Enthalpy of Formation02:37

Standard Enthalpy of Formation

49.2K
Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly accepted set of conditions used as a reference point for the determination of properties under other different conditions. For chemists, the IUPAC standard state refers to materials under a pressure of 1 bar and solutions at 1 M and does not specify a temperature. Many thermochemical tables list values with a standard state of 1 atm. Because...
49.2K
Enthalpy within the Cell01:18

Enthalpy within the Cell

7.6K
Enthalpy (H) is used to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum of a system's internal energy (U) and the mathematical product of its pressure (P) and volume (V):
H = U + PV
Enthalpy is also a state function. Enthalpy values for specific substances cannot be measured directly; only enthalpy changes for chemical or physical processes can be determined. For processes that take place at constant pressure (a common condition for many...
7.6K
Enthalpy and Heat of Reaction02:12

Enthalpy and Heat of Reaction

9.8K
Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
9.8K

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Air-sampled Filter Analysis for Endotoxins and DNA Content
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Air-sampled Filter Analysis for Endotoxins and DNA Content

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Outdoor environment management through air enthalpy analysis.

Firmo Sousa Campos1, Valéria Cristina Rodrigues Sarnighausen2, Carla Dos Santos Riccardi2

  • 1UNESP Bauru Campus, Sao Paulo, SP, Brazil. firmo.campos@unesp.br.

International Journal of Biometeorology
|February 13, 2019
PubMed
Summary
This summary is machine-generated.

Air enthalpy variations correlate with seasonal health issues like pneumonia. This index can help predict hospitalizations and inform public health strategies in urban environments.

Keywords:
Air enthalpyDiseasesHuman biometeorologyPreventive measurementsThermal comfort

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Area of Science:

  • Environmental Science
  • Public Health
  • Climatology

Background:

  • Urbanization exacerbates public health issues, particularly respiratory and cardiac symptoms, often worsened by climate change.
  • Analyzing environmental factors is crucial for public health decision-making and resource allocation.

Purpose of the Study:

  • To investigate the relationship between the air enthalpy index and seasonal chronic health issues in Botucatu, Brazil.
  • To assess the utility of air enthalpy as an indicator for thermal comfort and its impact on public health.

Main Methods:

  • Utilized the air enthalpy index to profile environmental conditions throughout the year.
  • Employed simple correlation analysis and t-tests to link enthalpy variations with hospitalization data.
  • Compared air enthalpy with the heat index for thermal sensation analysis.

Main Results:

  • Air enthalpy remained near thermal comfort boundaries year-round, with higher values during hotter months.
  • Hospitalizations increased during seasonal transitions from hot to cold periods.
  • A strong correlation was found between maximum enthalpy variation and pneumonia hospitalizations.

Conclusions:

  • Air enthalpy is a reliable and simple index for analyzing environmental thermal comfort.
  • Enthalpy variations are linked to increased respiratory illnesses, suggesting its utility in public health planning.
  • Further research with extended data and additional meteorological parameters is recommended.