Vapor pressure [a] or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's thermodynamic tendency to evaporate.

2021年4月24日 · Vapor pressure (or vapour pressure) is the equilibrium pressure of a vapor above its liquid or solid state in a closed container. In this type of closed system, some molecules of a liquid or solid have enough kinetic energy to escape at …

2023年1月30日 · The vapor pressure of a substance is the pressure that the gaseous part of the substance exerts on the container of said substance. The fact that the vapor pressure is equal to the external pressure can become important when …

The pressure exerted by the gas in equilibrium with a solid or liquid in a closed container at a given temperature is called the vapor pressure. Factors That Affect Vapor Pressure. Surface Area: the surface area of the solid or liquid in contact …

Vapour pressure, also known as vapour equilibrium pressure, can be defined as the pressure exerted (in a system featuring thermodynamic equilibrium) by a vapour with its condensed phases (solid or liquid) in a closed system at a given temperature.

Vapor pressure is the pressure exerted by a gas when it is in equilibrium with its liquid or solid form. In a closed container, some molecules of a liquid always escape into the air as gas, while some gas molecules return to the liquid. When the number of molecules leaving the liquid equals the number returning, the system is in equilibrium ...

The vapor pressure of a liquid is defined as the pressure exerted by the molecules that escapes from the liquid to form a separate vapor phase above the liquid surface. Vapor or saturation pressure depends on temperature. Approximate vapor pressure for temperatures in the range 20 oC - 25 oC (68 oF - 77 oF).

2025年2月28日 · Vapour pressure, pressure exerted by a vapour when the vapour is in equilibrium with the liquid or solid form, or both, of the same substance—i.e., when conditions are such that the substance can exist in both or in all three phases. Learn more about vapour pressure in this article.

P represents the vapor pressure of the substance (in Pascal or atmospheres, depending on the context).; ΔHvap is the enthalpy of vaporization, expressed in joules per mole (J/mol) or kilojoules per mole (kJ/mol).; R is the universal gas constant, typically 8.314 J/mol·K.; T denotes the absolute temperature in Kelvin (K).; C is an integration constant that depends on the …

Vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases. It represents the tendency of molecules in a substance to escape into the gaseous phase and is influenced by factors such as temperature and the nature of the substance.