Vaporization

Vaporization

What is Vaporization?

Vaporization can be defined as the process in which liquid state changes into the vapor state. As a result of an increase in temperature, the kinetic energy of the molecules increases. Due to the increases in kinetic energy, the force of attraction between the molecules reduces. As a result, they escape into the surrounding in the form of vapors. This process involves consumption of heat energy.

Vaporization

Vaporization can be divided into two types:

  • Evaporation
  • Boiling

Evaporation is different from boiling on the basis that evaporation is a surface phenomenon, unlike boiling which is a bulk phenomenon.

Ever wondered why water is stored in earthen pots?

Vaporization

The science involved in this medieval practice is evaporation. Water is stored in earthen pots especially in summers to keep the water cool. Earthen pots are made up of clay particles and have pores in them. When water is poured into the pot, it gets evaporated from the pores by absorbing heat from the remaining water in the pot. This causes the cooling of remaining water in the pot due to heat loss. Hence water is kept cool which makes it suitable for drinking during summers.

Factor affecting the rate of vaporization

  • Temperature: Vaporization is directly proportional to temperature. As the temperature rises the kinetic energy of the molecules also increases.As a result, the force of attraction reduces. Hence with an increase in temperature the rate of evaporation increases.
  • Surface area: With the increase in surface area, the rate of vaporization also increases as more number of particles is exposed to the change in temperature.
  • Pressure: Pressure is inversely propositional to evaporation. As pressure increases, it gets difficult for the particles to gain the required kinetic energy and escape.
  • Wind speed: With an increase in wind speed, the rate also increases as particles are driven away by the wind.

Examples of vaporization in our daily life are:

Vaporization

  • Industrially, salt is recovered from sea-water by the process of vaporization.
  • Wet clothes are dried up due to the process of vaporization.
  • The process is used in many industrial processes for separating the components of a mixture.

 

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Practise This Question

A liquid in equilibrium with its vapour at the boiling point. On the average, the molecule in two phase have equal: