Question

A.What are the ways in which a gas can be liquified?
B.Why does diffusion become faster at higher temperatures?
C.What do LPG and BEC stand for?
D.What type of clothes should we wear in summer and why?

Answer 1

Hint: This question is based on the concept of change of state of gases when they are exposed to different temperature and pressure conditions. It also involves the effect of increase in temperature on molecular motion in a gas. The conceptual argument of summer clothes also requires the knowledge of different absorption and radiation properties of materials.

Complete answer: a.In general, gases can be liquefied using one of three methods:
1) compressing the gas at temperatures below its critical temperature
2) making the gas perform some form of work against an external force, causing the gas to lose energy and shift to the liquid form
3) making the gas do work against its own internal forces, causing the gas to lose energy and liquefy.

b.The kinetic energy of molecules increases as the temperature rises. As a result, the number of collisions between particles or molecules will increase. As a result, molecules will migrate faster from one location to another. As a result, at greater temperatures, the rate of diffusion will rise.

c.LPG stands for Liquid Petroleum Gas and BEC stands for Bose Einstein Condensate.

d.We usually dress in light-colored cotton clothing during the summer. Summers make us sweat a lot. Cotton is a good water absorbent. As a result, it absorbs perspiration from our bodies and exposes it to the air, allowing it to evaporate more quickly. Particles on the sweat's surface gain energy from our body surface during evaporation, keeping us cool. Moreover, light coloured clothes are poor absorbers of heat.

Note:
In practice, this approach involves two processes for liquefaction of a gas. The gas is cooled first, then made to perform work against an external system. It could, for example, be propelled through a tiny turbine that rotates a set of blades. The energy lost as a result of running the turbine could be enough to turn the gas into a liquid.