Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure High temperature, high pressure

• Soln:

Answer is c) Low temperature, high pressure

Explanation:

To compress gas into liquid, low temperature and high pressure is required. Between the particles of gas there is lot of space. On applying pressure particles get closer and they start attracting each other to form a liquid. Lot of heat is generated when gas is compresses hence it is necessary to cool it. Cooling lowers the temperature of compressed gas and helps in liquefying it.