balance
Balance refers to a stable state, when subject to a variety of opposing aspects, if each part of each other offset, so that the overall no change is called balance. In economics, if the expenditure and income are equal, a balance is reached; in chemistry, if a positive reaction of a reversible reaction is equal to the inverse reaction, a balance is reached; in astronomy, a star on a main sequence, The sun, given at any level inside the star, is equal to the pressure (inward) of the heat pressure (outward) and the mass of the material outside it, and there is no excess energy to cause the stars to collapse to reach equilibrium status. In physics, if the force or torque offset each other, can also form a balance. If the change, but kept in an average and the overall changes in the regular fluctuations, is called dynamic balance, such as ecological balance. In addition, the balance can also be divided into stable balance and unstable balance ...