The volume of $1$ mole of any pure gas at standard temperature and pressure $(STP)$ is always equal to (in $m^3$)

Explain the following terms:
$(i)$ Isotherm
$(ii)$ Isochore
$(iii)$ Isobar

Fill in the blanks:
$(1)$ The properties of gases were first measured by ......... .
$(2)$ The dipole-dipole interaction energy between stationary polar molecules is proportional to .......... .
$(3)$ The interaction energy between rotating polar molecules is proportional to .......... .
$(4)$ The bond energy of a hydrogen bond is about ......... $kJ \ mol^{-1}$.

$A$ gas diffuses $1/3$ times as fast as hydrogen. Its molecular weight is

$X \ mL$ of $H_2$ gas effuse through a hole in a container in $5 \ seconds$. The time taken for the effusion of the same volume of the gas specified below under identical conditions is

Fill in the blanks:
$(1)$ The temperature at which gases possess zero volume is called ........... .
$(2)$ In a mixture of gases,the pressure exerted by each individual gas is called .......... .
$(3)$ The pressure exerted by water vapor is known as ..... .
$(4)$ Thermal energy is directly proportional to the ..... of the substance.