While riding to the store today I thought about
“equilibrium”. It is the usual wake-up ride and every now and then I’m cruising
down the street and wondering what I’m doing?
The
definition of “equilibrium” is…
1. A condition in which others, resulting in a stable,
balanced, cancel all acting influences or unchanging system.
2. Mental or emotional balance; poise.
3. Physics: The state of a body or physical system at rest
or in un-accelerated motion in which the resultant of all forces acting on it
is zero and the sum of all torques about any axis is zero.
4. Chemistry: The state of a chemical reaction in which its
forward and reverse reactions occur at equal rates so that the concentration of
the reactants and products does not change with time.
I could get into all the crazy variations, but…
Biology
* Equilibrioception, the sense of a balance present in
human beings and animals
* Equilibrium unfolding, the process of unfolding a protein
or RNA molecule by gradually changing its environment
* Genetic equilibrium, theoretical state in which a
population is not evolving
* Homeostasis, the ability of an open system, especially
living organisms, to regulate its internal environment
* Punctuated equilibrium, theory in evolutionary biology
* Sedimentation equilibrium, analytical ultracentrifugation
method for measuring protein molecular masses in solution
* Equilibrium Theory (Island biogeography),
MacArthur-Wilson theory explaining biodiversity character of ecological islands
Physics
* Equilibrium figures of Earth and planets (physical
geodesy)
* Equilibrium mode distribution, the state of fiber optic
or waveguide transmission in which the propagation mode does not vary with
distance along the fiber or changes in the launch mode
* Hydrostatic equilibrium, the state of a system in which
compression due to gravity is balanced by a pressure gradient force
* Hyperbolic equilibrium point, a mathematical concept in
physics
* Mechanical equilibrium, the state in which the sum of the
forces, and torque, on each particle of the system is zero
* Radiative equilibrium, the state where the energy
radiated is balanced by the energy absorbed
* Secular equilibrium, a state of radioactive elements in
which the production rate of a daughter nucleus is balanced by its own decay
rate
* Thermal equilibrium, a state where an object and its
surroundings cease to exchange energy in the form of heat, i.e. they are at the
same temperature.
Chemistry
* Chemical equilibrium, the state in which the
concentrations of the reactants and products have no net change over time
* Diffusion equilibrium, when the concentrations of the
diffusing substance in the two compartments are equal
* Donnan equilibrium, the distribution of ion species
between two ionic solutions separated by a semi-permeable membrane or boundary
* Dynamic equilibrium, the state in which two reversible
processes occur at the same rate
* Equilibrium constant, a quantity characterizing a
chemical equilibrium in a chemical reaction
* Partition equilibrium, a type of chromatography that is
typically used in GC
* Quasistatic equilibrium, the quasi-balanced state of a
thermodynamic system near to equilibrium in some sense or degree
* Schlenk equilibrium, a chemical equilibrium named after
its discoverer Wilhelm Schlenk taking place in solutions of Grignard reagents
* Solubility equilibrium, any chemical equilibrium between
solid and dissolved states of a compound at saturation
* Thermodynamic equilibrium, the state of a thermodynamic
system, which is in thermal, mechanical, and chemical equilibrium
* Vapor-liquid equilibrium, where the rates of condensation
and vaporization of a material are equal
Economics
* Competitive equilibrium, economic equilibrium when all
buyers and sellers are small relative to the market
* Economic equilibrium, a condition in economics
* Equilibrium price, the price at which quantity supplied
equals quantity demanded
* General equilibrium theory, a branch of theoretical
microeconomics
* Intertemporal equilibrium, an equilibrium concept over
time
* Lindahl equilibrium, a method proposed by Erik Lindahl
for financing public goods
* Partial equilibrium, the equilibrium price and quantity
which come from the cross of supply and demand in a competitive market.
* Radner equilibrium, an economic concept defined by
economist Roy Radner in the context of general equilibrium
* Recursive competitive equilibrium, an economic
equilibrium concept associated with a dynamic program
* Static equilibrium (economics), the intersection of
supplies and demand in any market
* Sunspot equilibrium, an economic equilibrium in which
non-fundamental factors affect prices or quantities
* Underemployment equilibrium, a situation in Keynesian
economics with a persistent shortfall relative to full employment and potential
output
Game
theory
* Correlated equilibrium, a solution concept in game theory
that is more general than the well-known Nash equilibrium
* Nash equilibrium, a solution concept in game theory
involving two or more players
* Quasi-perfect equilibrium, a refinement of Nash
Equilibrium for extensive form games due to Eric van Damme
* Sequential equilibrium, a refinement of Nash Equilibrium
for extensive form games due to David M. Kreps and Robert Wilson
* Symmetric equilibrium, in game theory, an equilibrium
where all players use the same strategy
* Trembling hand perfect equilibrium assumes that the
players, through a "slip of the hand" or tremble, may choose
unintended strategies
* Proper equilibrium due to Roger B. Myerson, where costly
trembles are made with smaller probabilities
Other
* Social equilibrium, a system in which there is a dynamic
working balance among its interdependent parts
* Equilibrium moisture content, the moisture content at
which the wood is neither gaining nor losing moisture
* Equilibrium point, node in mathematics
* Reflective equilibrium, the state of balance or coherence
among a set of beliefs arrived at by a process of deliberative mutual
adjustment
You can analysis your feelings and wonder about your thoughts
but in the long run, when you wake up and crawl into your clothing and brush
your teeth and wash your face, you walk into reality. And reality is what it is
all about.
As much as we would love to live in a fantasy world of
books and television adventures and calming music or whatever we can get lost
in, there is that stinking reality that makes us wake up and pay the bills and
take out the trash and clean the toilet.
So if equilibrium is the balance of our life, the gyro that
keeps us on the straight and narrow, what happens when we doubt it?