Select the correct statements.

Relative humidity $\text{=\hspace{0.17em}}\frac{{\text{P}}_{{\text{H}}_{\text{2}}\text{O}}}{{\text{P}}_{{\text{H}}_{\text{2}}\text{O}}^{\text{0}}}\text{\hspace{0.17em}×\hspace{0.17em}100}$

 ${\text{P}}_{H_{2}O}=$ Partial pressure of ${\text{H}}_{\text{2}}\text{O}$ vapour in the air

 ${\text{P}}_{H_{2}O}^0=$Equilibrium vapour pressure of water at the same temperature

The air at which the relative humidity reaches 100% is called the dew point.

Pay load = [Mass of air filled in the balloon] – [Mass of gas filled in the balloon at same

temperature and pressure + Mass of the balloon]

Location of straight one and curve does not temperature in isothermal graphs