Comparison Table

Law	Variables	Constant	Formula	Graph	Example
Boyle's	P and V	T, n	PV = k or $P_{1}V_{1}$ = $P_{2}V_{2}$	P vs V: hyperbola; PV vs P: horizontal line	Doubling P → halves V
Charles's	V and T	P, n	V/T = k or $V_{1}$ / $T_{1}$ = $V_{2}$ / $T_{2}$	V vs T(K): straight line through origin	Doubling T → doubles V
Gay-Lussac's	P and T	V, n	P/T = k or $P_{1}$ / $T_{1}$ = $P_{2}$ / $T_{2}$	P vs T(K): straight line through origin	Doubling T → doubles P
Avogadro's	V and n	T, P	V/n = k or $V_{1}$ /n_{1} = $V_{2}$ /n_{2}	V vs n: straight line through origin	Doubling n → doubles V
Combined	P, V, T	n	$P_{1}V_{1}$ / $T_{1}$ = $P_{2}V_{2}$ / $T_{2}$	—	All three change together
Ideal Gas	All	None	PV = nRT	—	Most general form

Critical notes for NEET: