From Bioblast
Description
Work [J] is a specific form of energy, called exergy, performed by a closed or open system on its surroundings (the environment). This is the definition of external work, which is zero in isolated systems. Mechanical work is force [N] times path length [m]. The internal-energy change, dU, is due to exchange of work and heat, and work is the internal energy change minus heat,
dW = dU - dQ
Abbreviation: W [J]
Reference: Gnaiger (1993) Pure Appl Chem
Communicated by Gnaiger E 2018-10-20
Pressure-volume work
- Pressure-volume work, dVW, at constant pressure, is the gas pressure, p [Pa = JΒ·m-3], times volume, V [m3],
dVW = -pΒ·dV [J]
- The available work, deW, is distinguished from external total work as [1]
deW = dW - dVW
- The enthalpy change, dH, at constant pressure, is defined as internal-energy change minus pressure-volume work,
dH = dU - dVW
References
- Gnaiger E (1993) Nonequilibrium thermodynamics of energy transformations. Pure Appl Chem 65:1983-2002. - Β»Bioblast linkΒ«
MitoPedia concepts:
Ergodynamics