বয়েলের সূত্র কোনটি?

$\mathrm{P}_{1} \mathrm{~V}_{1}=\mathrm{P}_{2} \mathrm{~V}_{2}$

$\frac{\mathrm{V}_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}$

$\frac{P_{1}}{T_{1}}=\frac{P_{2}}{T_{2}}$

$\frac{V_{1}}{V_{2}}=\frac{N_{1}}{N_{2}}$