# Liquid to Gas

How matter changes from Liquid to Gas: Matter exists in three physical states: solid, liquid, and gaseous state. For example- water exists as a liquid and turns solid when kept in the refrigerator, and as steam ( or water vapour) out of the kettle of a boiling water. We can change the physical state of matter using two ways:

• By changing the temperature.
• By changing the pressure.

This results in the change of kinetic energy (or say) movement of particles.

## Liquid to Gas Phase Change

Water normally exists in the liquid state. If we go on heating water the time will come it starts boiling.  Soon, liquid changes into gas(steam). Here, liquid water changes into the gas. So a change of state has taken place.

When we heat liquid particles starts moving. Heat energy makes particles to move even faster. At the boiling point, the particles have sufficient kinetic energy(motion). This kinetic energy overcomes the force of attraction holding them together. This will separate into individual particles and liquid boils to form a gas.

## Gas to Liquid Phase Change

When we cool a gas by lowering its temperature then particles lose its kinetic energy. This result they start coming closer and being attracted to each other.This form the Liquid. The process through which gas changes to a liquid is called as condensation.

## Why Boiling point different for different substance?

The boiling point of liquid changes with the force of attraction between the particles.Higher the boiling point greater will be the force of attraction. For example. the boiling point of Mercury is very high which tells us that force of attraction between the particles is very strong.

## Water Boils at 100 degrees Celsius?

We heat water to a temperature of 100ºC. It changes into the gas. So the boiling point of water is 100ºC. The liquid(water) substance the particles attract one in the another with force. These forces of attraction hold the water particles together.In the liquid state, the heat which we supply to a water breaks the force of attraction. So, they become totally free.The heat supply changes liquid to gas does not increase the kinetic energy. Hence, no rise in temperature above 100 0C

The process in which liquid substance changes into gas on heating we call as boiling.

The temperature at which liquid boils and changing into the gas we call as the boiling point of the liquid.

## Liquid to Gas Examples

The different liquids have different boiling points. The values remain same for the Gas to liquid Change. Few of them are listed below:

 Substance Boiling Point(0C) Water 100 Alminium 2467 Iron 2212 Alcohol 78 Mercury 357

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