Which shape does a liquid have in its lowest energy state?

What is the difference between a barometer and a manometer?

$50 \ mL$ of each gas $A$ and gas $B$ takes $150$ and $200$ seconds respectively for effusing through a pinhole under similar conditions. If the molecular mass of gas $B$ is $36$,the molecular mass of gas $A$ will be:

Hydrogen gas diffuses $4$ times faster than a mixture of $C_2H_4$ and $CO_2$. Find the molar ratio of $C_2H_4$ and $CO_2$ in the mixture.

The ratio of rates of diffusion of $SO_2$,$O_2$ and $CH_4$ is

Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain the pressure of dry gas?