Answer – The phase transition changing liquid into gas is called evaporation.
Explanation:
Most substances can exist in multiple different states or phases of matter, based on the temperature and pressure conditions of their surroundings. These states of matter are dependent on the kinetic energy possessed by the molecules of the substance, and it is affected by the surrounding temperature and pressure.
The molecules in liquids have less energy when compared to those in gases of the same substance. Thus, in order to change a liquid into a gas, this energy must be increased. This can be achieved by increasing temperature and/or decreasing pressure. The transition phase between the two states is called evaporation.
If the pressure is constant, temperature is increased, and if the temperature is maintained at a consistent level, then pressure is decreased in order to achieve evaporation. However, just altering these two factors randomly is not enough. Depending on the substance, its molecules will need to acquire a specific amount of energy before being able to change phase. The point at which this energy is acquired is called the boiling point of that substance. Thus, evaporation takes place only at the boiling point of that substance.
