Pressure and temperature determine the state of a substance. Explain this in detail.

Pressure:

On increasing pressure:

i. On increasing pressure, particles of matter come closer.

ii. If pressure is increasingly applied on a gas, particles of the gas come more closer and a stage is reached when gas may change into liquid.

iii. If pressure is increasingly applied on a liquid, it will change into liquid.

On reducing pressure:

i. On reducing pressure, particles of matter expand.

ii. If reducing pressure is applied on a liquid, it will change into gas.

iii. If reducing pressure is applied on a solid, it will change into liquid.

Temperature:

On increasing temperature:

i. The kinetic energy of the particles increases.

ii. Due to the increase in kinetic energy, the particles start vibrating with greater speed.

iii. As a result, the particles leave their fixed positions and start moving freely.

iv. If temperature is increasingly applied on solid, it will change into liquid state.

On decreasing temperature:

i. On decreasing the temperature of any state, the particles come closer:

ii. If we apply reducing temperature on gas, it will change into liquid.

iii. If we apply reducing temperature on liquid, it will change into solid.