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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Dennis Normile

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    |December 22, 2022
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    Resumen

    Nueva Zelanda tiene como objetivo ser libre de humo, guiada por diez años de investigación en salud pública. Este plan integral tiene como objetivo una reducción significativa de las tasas de tabaquismo en todo el país.

    Área de la Ciencia:

    • Salud pública
    • El control del tabaco
    • Política de salud

    Sus antecedentes:

    • El tabaquismo sigue siendo un problema de salud pública importante a nivel mundial.
    • Las estrategias basadas en la evidencia son cruciales para un control eficaz del tabaco.
    • Nueva Zelanda tiene una historia de implementación de iniciativas innovadoras de salud pública.

    Objetivo del estudio:

    • Esbozar un plan estratégico para lograr una Nueva Zelanda libre de humo.
    • Para sintetizar una década de investigación en la política de salud pública de acción.
    • Proporcionar un marco para reducir la prevalencia del tabaquismo y los daños asociados.

    Principales métodos:

    • Revisión exhaustiva de la literatura sobre la investigación para el control del tabaco.

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  • Análisis de los programas y políticas existentes para dejar de fumar.
  • Consultas con las partes interesadas y talleres de desarrollo de políticas.

    • Principales resultados:

    • Un plan multifacético que incluya estrategias legislativas, educativas y de apoyo para dejar de fumar.
    • Identificación de las intervenciones clave para las poblaciones de alto riesgo.
    • Impacto proyectado en las tasas de tabaquismo y en los resultados de salud pública.

    Conclusiones:

    • Una década de investigación proporciona una base sólida para un futuro libre de humo.
    • La voluntad política sostenida y el compromiso de la comunidad son vitales para el éxito.
    • El plan propuesto ofrece un modelo escalable para otras naciones.