Question

Define vapour pressure.

Answer 1

Hint: We know that vapour pressure is nothing but the the pressure exerted by a vapour in thermodynamic equilibrium with its condensed phases (solid or liquid) at a certain temperature in a closed system.We can also keep in mind that the evaporation rate of a liquid is determined by the equilibrium vapour pressure. It has to try with particles' proclivity for escaping from liquids (or a solid).

Complete answer:
Vapour pressure can be defined as a measurement of a material's tendency to change state from solid to liquid to gas or vapour when the temperature rises. It represents the rate at which a liquid evaporates. It's also linked to the tendency for particles to escape from a liquid or solid state.
Vapour pressure is a liquid attribute that has to do with evaporation. To put it another way, it's the pressure exerted by a vapour in equilibrium with its phases, whether solid or liquid, at a particular temperature and in a closed system.
The standard units of pressure are used to measure vapour pressure. Pressure is a derived unit with the dimension of force per area recognised by the International System of Units (SI), which uses the pascal (Pa) as its standard unit.

Note:
It can be noted that there is a relationship between vapour pressure and temperature. A volatile material is one that has a high vapour pressure at room temperature. The kinetic energy of molecules increases as the temperature of a liquid solution rises.