An equation is given as : p + a

An equation is given as : p + a - b θ
V² V

where P = Pressure, V = Volume & θ = Absolute temperature. If a and b are constants, then dimensions of a will be

		p +	a		= b	Q
			V²			V

According to the principle of homogeinity quantity with same dimension can be added or subtracted.

Hence, Dimension of P = Dimension of	a
	V²

⇒ Dimension of	Force	= Dimension of	a
	Area		V²

⇒			MLT^-2			=	a	⇒ a = [M L⁵ T^-2]
			L²				[L³]²