What is the difference betwn molarity …

Molality (m) : It is the number of moles of the solute dissolved per kilogram (kg) of the solvent. It is denoted by m.
{tex}\therefore{/tex} Molality (m) {tex} = \frac{{{\text{No}}{\text{. of Moles of solute}}}}{{{\text{Mass of solvent in kg}}}}{/tex}
{tex}\therefore \,m = \frac{{{W_2} \times 1000}}{{{M_2} \times {W_1}}}{/tex}
Where W₁ = mass of solvent
W₂ = mass of solute
M₂ = Molar mass of solute . Unit is mol/Kg
Molarity (m): It is the number of moles of the solute dissolved per litre of the solution. It is denoted by M.
Molarity {tex} = \frac{{{\text{No}}{\text{. of moles of solute}}}}{{{\text{Volume of solution in litre}}}}{/tex}
{tex}\therefore \;M = \frac{{{W_2} \times 1000}}{{{M_2} \times {V_1}}}{/tex}
where W₂ = mass of solvent
M₂ = molar mass of solute
V = Volume of solution. Unit is mol/L
The molarity and molality of a solution will be nearly same if the mass of solvent is nearly equal to the volume of solution.