Equilibrium reactions are those reactions that are reversible and do not go to completion but remain at a state at which all measurable quantities remain constant with time.
In short ,equilibrium reactions show no net change in any of the parameters as temperature ,pressure, and concentration that are characteristic of any reaction. Equilibrium or balance is any of a number of related phenomena in the natural and social sciences. In general, a system is said to be in a state of equilibrium if all influences on the system are cancelled by the effects of others. A related concept is stability; an equilibrium may or may not be stable.
Equilibrium is a word denoting a static condition, the absence of macroscopic change with respect to time. In thermodynamics it is taken to mean not only the absence of change but also the absence of any tendency toward change on a macroscopic scale. Thus, a system at equilibrium is one that exists under such conditions that there is no tendency for a change in state to occur. Since any tendency toward change is caused by a driving force of one kind or another, the absence of such tendency indicates also the absence of any driving force.
The concept of equilibrium encompasses three varieties:
• mechanical equilibrium (the pressure within a system is the same at all points),
• thermal equilibrium (the temperature is uniform throughout a system), and
• chemical equilibrium (the species composing a system no longer tend to react).
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