Chemistry (NTSE/Olympiad)  

1. Matter In Our Surrounding

Effect of Pressure Change

Effect of change of pressure
The three states of matter differ in the intermolecular forces and intermolecular distances between the constituent particles.
Gases are compressible because on applying pressure, the space between the gaseous particles decreases. Therefore, gases can be compressed readily.
When we apply pressure and reduce temperature the gases can be converted into liquids i.e., gases will be liquefied.
The process of conversion of a gas into a liquid by increasing pressure or decreasing temperature is called liquefication.
A substance may exist in any of the three different states of matter depending upon the conditions of temperature and pressure.
(1) If the melting point of a substance is above the room temperature at the atmospheric pressure, it is said to be a solid.
(2) If the boiling point of a substance is above room temperature under atmospheric pressure, it is classified as liquid.
(3) If the boiling point of the substance is below the room temperature at the atmospheric pressure, it is called a gas.

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