What is the significance of the term ρgh in the pressure equation for a fluid at rest?
ρgh represents the hydrostatic pressure due to the weight of the fluid column above a point, increasing with depth, as it accounts for gravitational potential energy per unit volume. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Hydrostatic pressure. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
Ref: NCBI Bookshelf, Ideal Gas Law: P1V1/T1 = P2V2/T2.