Question

what is vapoure pressure

Answer 1

Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermo dynamic equilibrium with it's condensed phases(solid or liquid) at a given temperature in aclosed system. The equilibrium vapor pressure is an indication of a liquid'sevaporationrate. It relates to thetendency of particles to escape from the liquid (or a solid). A substance with a high vapor pressure at normal temperatures is often referred to asvolatile. The pressure exhibited by vapor present above a liquid surface is known as vapor pressure. As the temperature of a liquid increases, the kinetic energy of its molecules also increases. As the kinetic energy of the molecules increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.The vapor pressure of any substance increases non-linearly with temperature according to theClausius–Clapeyron relation. Theatmospheric pressureboiling pointof a liquid (also known as thenormal boiling point) is the temperature at which the vapor pressure equals the ambient atmospheric pressure. With any incremental increase in that temperature, the vapor pressure becomes sufficient to overcomeatmospheric pressureand lift the liquid to form vapor bubbles inside the bulk of the substance.Bubbleformation deeper in the liquid requires a higher pressure, and therefore higher temperature, because the fluid pressure increases above the atmospheric pressure as the depth increases.The vapor pressure that a single component in a mixture contributes to the total pressure in the system is calledpartial pressure. For example, air at sea level, and saturated with water vapor at 20 °C, has partial pressures of about 2.3 kPa of water, 78 kPa ofnitrogen, 21 kPa ofoxygenand 0.9 kPa ofargon, totaling 102.2kPa, making the basis forstandard atmospheric pressure.

Answer 2

Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's evaporation rate.