Question

What is vapor pressure and what causes it?

Answer 1

1. The equilibrium pressure of a vapor above its liquid or solid-state is termed vapor pressure.
2. Vapour pressure is defined as the tendency of the particles to escape from solid or liquid.
3. On increasing the temperature, the rate of evaporation increases which increases the vapor pressure, or on decreasing temperature, the rate of evaporation decreases, and thus the vapor pressure decreases.
4. Vapor pressure depends on intermolecular forces if the intermolecular forces are strong then it will become difficult for the particles to move fast due to which the vapor pressure becomes low whereas if the intermolecular forces between the molecules are weak then the vapor pressure becomes high.
5. So, we can say that vapor pressure is inversely proportional to the intermolecular forces and directly proportional to the temperature.