Isokoorinen

Isokoorinen is a Finnish adjective used primarily in thermodynamics and physics to describe a process or state in which the volume remains constant. In Finnish educational and scientific literature the term is applied to isochoric processes, which are contrasted with isobaarinen (constant pressure) and isoterminen (constant temperature) processes. The form is commonly written as isokoorinen, with a less frequent variant iso­choorinen appearing in some texts.

Etymology and usage

The word isokoorinen is formed from the prefix iso- meaning equal, combined with a Finnish adaptation related to space or chamber, reflecting the notion of a fixed volume. The term is widely understood in Finnish science contexts to designate systems where the volume does not change during the process, regardless of temperature or pressure variations.

Examples and implications

A typical example is a gas confined in a rigid, sealed container that is heated. Since the container does not allow volume change, the pressure rises as the temperature increases (for an ideal gas, P ∝ T when V is constant). The work done by the system is zero in an isochoric process because dV = 0, and for an ideal gas the internal energy change ΔU depends only on ΔT (ΔU = nCvΔT). Isokoorinen processes are important in calorimetry, combustion analysis, and many engineering calculations where volume constraints are present.

See also

Isobaarinen prosessi (constant pressure) and isoterminen prosessi (constant temperature).