Isochoric Process
A thermodynamic process occurring at constant volume, during which no mechanical boundary work is performed.
Governing formula
ΔV = 0 ⇒ W = 0, Q = ΔU = n Cv ΔT
SI unit
J
In depth
Because volume is fixed, no $P dV$ work can be done ($W = 0$). All heat transferred directly alters internal energy and system temperature.
Examples in the real world
Heating gas inside a rigid sealed steel pressure vessel.