Search results
Results from the WOW.Com Content Network
A specific property is the intensive property obtained by dividing an extensive property of a system by its mass. For example, heat capacity is an extensive property of a system. Dividing heat capacity, , by the mass of the system gives the specific heat capacity, , which is an intensive property. When the extensive property is represented by ...
The pressure is the intensive generalized force, while the volume change is the extensive generalized displacement: δ W = P d V . {\displaystyle \delta W=P\,\mathrm {d} V.} This defines the direction of work, W {\displaystyle W} , to be energy transfer from the working system to the surroundings, indicated by a positive term.
Internal pressure can be expressed in terms of temperature, pressure and their mutual dependence: = This equation is one of the simplest thermodynamic equations.More precisely, it is a thermodynamic property relation, since it holds true for any system and connects the equation of state to one or more thermodynamic energy properties.
Work and heat are not thermodynamic properties, but rather process quantities: flows of energy across a system boundary. Systems do not contain work, but can perform work, and likewise, in formal thermodynamics, systems do not contain heat, but can transfer heat.
Extensive parameters are properties of the entire system, as contrasted with intensive parameters which can be defined at a single point, such as temperature and pressure. The extensive parameters (except entropy ) are generally conserved in some way as long as the system is "insulated" to changes to that parameter from the outside.
intensive Mean lifetime: τ: Average time for a particle of a substance to decay s T: intensive Molar concentration: C: Amount of substance per unit volume mol⋅m −3: L −3 N: intensive Molar energy: J/mol: Amount of energy present in a system per unit amount of substance J/mol L 2 M T −2 N −1: intensive Molar entropy: S° Entropy per ...
The pressure acts as a generalized force – pressure differences force a change in volume, and their product is the energy lost by the system due to mechanical work. Pressure is the driving force, volume is the associated displacement, and the two form a pair of conjugate variables. The above holds true only for non-viscous fluids.
The state postulate is a term used in thermodynamics that defines the given number of properties to a thermodynamic system in a state of equilibrium. It is also sometimes referred to as the state principle. [1] The state postulate allows a finite number of properties to be specified in order to fully describe a state of thermodynamic equilibrium.