isolated system

(noun)

A system that does not interact with its surroundings, that is, its total energy and mass stay constant.

Related Terms

  • constituting
  • internal energy
  • frictional force
  • conservation

Examples of isolated system in the following topics:

  • The Law of Conservation of Mass

    • The law of conservation of mass states that mass in an isolated system is neither created nor destroyed.
    • This law states that, despite chemical reactions or physical transformations, mass is conserved -- that is, it cannot be created or destroyed -- within an isolated system.
    • This law was later amended by Einstein in the law of conservation of mass-energy, which describes the fact that the total mass and energy in a system remain constant.
  • Conservation of Mechanical Energy

    • Conservation of mechanical energy states that the mechanical energy of an isolated system remains constant without friction.
    • Conservation of mechanical energy states that the mechanical energy of an isolated system remains constant in time, as long as the system is free of all frictional forces.
    • An example of a such a system is shown in .
    • Though energy cannot be created nor destroyed in an isolated system, it can be internally converted to any other form of energy.
    • The total kinetic plus potential energy of a system is defined to be its mechanical energy (KE+PE).
  • Changes in Energy

    • For isolated systems, entropy never decreases.
    • Increases in entropy correspond to irreversible changes in a system.
    • The entropy of a system is defined only if it is in thermodynamic equilibrium.
    • In an isolated system such as the room and ice water taken together, the dispersal of energy from warmer to cooler always results in a net increase in entropy.
    • The second law of thermodynamics shows that in an isolated system internal portions at different temperatures will tend to adjust to a single uniform temperature and thus produce equilibrium.
  • The Three Laws of Thermodynamics

    • The system and surroundings are separated by a boundary.
    • A closed system may still exchange energy with the surroundings unless the system is an isolated one, in which case neither matter nor energy can pass across the boundary.
    • The second law of thermodynamics says that the entropy of any isolated system always increases.
    • Isolated systems spontaneously evolve towards thermal equilibrium—the state of maximum entropy of the system.
    • More simply put: the entropy of the universe (the ultimate isolated system) only increases and never decreases.
  • Comparison of Enthalpy to Internal Energy

    • A thermodynamic system can be any physical system with a well-defined volume in space.
    • Hence, -q means the system loses heat, while +q means a system gains heat.
    • Similarly, +w means work is done on the system, while -w means work is done by the system.
    • Because the internal energy encompasses only the energy contained within a thermodynamic system, the internal energy of isolated systems cannot change.
    • However, in open systems, the pressure of the system and the surroundings has stayed constant.
  • Northern Blots

    • The Northern blot is a technique used in molecular biology research to study gene expression in a sample, through detection of RNA (or isolated messenger RNA ).
    • Eukaryotic mRNA can then be isolated through the use of oligo (dT) cellulose chromatography to isolate only those RNAs with a poly(A) tail.
    • Since the gels are fragile and the probes are unable to enter the matrix, the RNA samples, now separated by size, are transferred to a nylon membrane through a capillary or vacuum blotting system.
  • Feral Children

    • A feral child is a human child who has lived isolated from human contact from a very young age.
    • A feral child is a human child who has lived isolated from human contact from a very young age, and has no (or little) experience of human care, loving or social behavior, and, crucially, of human language.
    • Some feral children have been confined in isolation by other people, usually their own parents.
    • Several cases have been discovered in which caretakers brutally isolated their children and in doing so prevented normal development.
    • She communicates through the PECS system and loves to swim and ride horses.
  • Social Isolation

    • However, individuals in every society must cope with social isolation.
    • Social isolation refers to a complete or near-complete lack of contact with society.
    • Social isolation is distinct from loneliness.
    • Loneliness is often viewed as the subjective counterpart to social isolation.
    • Any individual from any segment of society may be socially isolated, but senior citizens are especially susceptible to the risk factors that may trigger social isolation.
  • Sourcing Technology

    • Technology sourcing involves isolating and implementing new innovations within an existing business framework.
    • Technology sourcing, or the pursuit of implementing new technologies within a businesses strategic framework, involves isolating and applying new technologies to current models.
    • Technology can be developed internally or isolated through technology scouting and then implemented through technology transfer.
    • When technology scouting isolates new developments that could potentially provide advantages for an incumbent, strategies to acquire or source this technology become a focal point.
    • Technology develops through a series of stages: basic technology research, research to prove feasibility, technology development, technology demonstration, system/subsystem development, and system test, launch & operations.
  • The Systems Viewpoint

    • Systems thinking is an approach to problem solving that considers the overall system instead of focusing on specific parts of a system.
    • Systems thinking is the process of understanding how people and situations influence one another within a closed system.
    • Systems generally contain the following aspects:
    • Practitioners of systems thinking believe that the component parts of a system can best be understood, and best analyzed, in the context of their relationships with other parts of a system .
    • Focus on the interaction of isolated problems with one another: just as separate gears work with each other, problems in one area can effect other areas in a system as well.
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