Question

Seema visited a Natural Gas Compressing Unit and found that to liquify gases, we need specific conditions of temperature and pressure. While sharing her experience with her friends she got confused. Help her identify the correct set of conditions:

• A. Low temperature, low pressure
• B. High temperature, low pressure
• C. Low temperature, high pressure
• D. High temperature, high pressure

Answer 1

The correct option is C Low temperature, high pressure

Applying pressure means forcing the particles of matter towards each other (reducing the free space between the particles). Thus, the application of pressure reduces the inter-atomic distance. As a result, the application of large pressure changes the gas into liquid first and then into a solid.
Reducing the temperature reduces the kinetic energy of the matter; thus, atoms of the particle will not move in random motion and will convert into liquid. Hence, applying high pressure and reducing temperature leads to liquefaction of gases.