Adiabatic demagnetisation is a technique used for

Assertion : Wet air is heavier than dry air.
Reason : The density of dry air is more than density of water.

Two flasks $A$ and $B$ have equal volumes. $A$ is maintained at $300 \ K$ and $B$ at $600 \ K$. Equal masses of $H_2$ and $CO_2$ are taken in flasks $A$ and $B$ respectively. Find the ratio of total $K.E.$ of gases in flask $A$ to that of $B$.

During winter,when taking a bath,water vapour appears. Explain the physical process.

$A$ mixture of equal masses of $SO_2$,$CH_4$,and $O_2$ is taken in an empty container at $298 \, K$. If the total pressure is $2.1 \, atm$,the partial pressure of $CH_4$ in the mixture will be .......... $atm$.

The rate of diffusion of $H_2$ is .......