
in the balance
[Middle English balaunce, from Old French, from Vulgar Latin *bilancia, having two scale pans, from Latin bilānx : bi-, two + lānx, scale.]
balanceable bal'ance·a·ble adj.| bail, bale, baggage, bade | |
| baleful, baneful, ball game, ballpark, balm |
For more information on balance, visit Britannica.com.
An instrument used for the precise measurement of small weights or masses in amounts ranging from micrograms up to a few kilograms.
Balances are differentiated according to design, weighing principle, and metrological criteria (see table). For a given weighing task, a balance is selected primarily for its maximum weighing load (Max) and for the finest graduation or division (d) of its weight-reading device (scale dial, digital display, readout).
Type | Division (d) | Typical capacity (Max) |
|---|---|---|
Ultramicroanalytical | 0.1 μg | 3 g |
Microanalytical | 1 μg | 3 g |
Semimicroanalytical | 0.01 mg | 30 g |
Macroanalytical | 0.1 mg | 160 g |
Precision | ≥1 mg | 160 g–60 kg |
Balances can be roughly differentiated from scales by their resolution or number of scale divisions, n = Max/d. Balances typically have a resolution of more than 10,000 divisions, and scales for the most part have less.
A traditional mechanical balance consists of a symmetric lever called a balance beam, two pans suspended from its ends, and a pivotal axis (fulcrum) at its center (see illustration). The object to be weighed is placed on one pan, whereupon the balance is brought into equilibrium by placing the required amount of weights on the opposite pan. Thus the weight of an object is defined as the amount represented by the calibrated standard masses that will exactly counterbalance the object on a classic equal-arm balance. Although this is not self-evident with modern balances and scales, the measurement of weight continues to be based on this original understanding.
pivot; C, center of gravity.">
Mechanical balance design. (a) Critical design aspects for an equal-arm balance. (b) Weighing small weight differentials with an equal-arm balance. (c) Top-loading equal-arm balance. F, fulcrum; E, end pivot; C, center of gravity.
The substitution principle represented the conclusive step in the evolution of the mechanical balance. Substitution balances have only one hanger assembly, incorporating both the load pan and a built-in set of weights on a holding rack. The hanger assembly is balanced by a counterpoise which is rigidly connected to the other side of the beam. The weight of an object is determined by lifting weights off the holding rack until the balance returns to an equilibrium position within its angular, differential weighing range. Small increments of weight in between the discrete dial weight steps are read from the projected screen image of a graduated optical reticle which is rigidly connected to the balance beam.
The evolution of electronic (more accurately, electromechanical) balances started in the late 1960s and has extended over several generations of electronic technology. Among a number of technical possibilities, one operating principle, electromagnetic force compensation, emerged early as the standard in high-precision weighing. First described by K. Ångström in 1895, the principle of electromagnetic force compensation became feasible for technical application as a result of the advancements in solid-state electronic components.
In every electromechanical weighing system, there are three basic functions: (1) The load-transfer mechanism, composed of the weighing platform or pan, levers, and guides, receives the weighing load on the pan as a randomly distributed pressure force and translates it into a measurable single force. (2) The electromechanical force transducer, often called load cell, converts the mechanical input force into an electrical output, for example, voltage, current, or frequency. (3) The electronic signal-processing part of the balance receives the output signal, converts it to numbers, performs computation, and displays the final weight data on the readout.
Besides improved accuracy, reliability, and speed of operation, the main benefits from this technology are human-engineered design for optimized interaction between operator and instrument, and numerous operating conveniences such as push-button zero setting, automatic calibration, built-in computing capabilities for frequently used work procedures, and data output to printers and computers.
Advertising: blending of sounds, such as music and dialogue in television or radio, to achieve the desired proportion of volume; also, the artful blending of copy, drawings, illustrations, photographs, and other decorative material used in print advertisements to effect a pleasing aesthetic appearance.
Fulfillment: process of matching an updated file against the previous file, together with all subsequent transactions that should have been applied against it, to ensure that processing was done correctly. See also batch balance.
List rental: names remaining on a list after a selection has been made for rental or house promotion.
| Bad Title, Backup Contract | |
| Balance Sheet, Balance, Principle Of |
| Bailout Payback Method Payback Period, Bailment, Baidu | |
| Balance Sheet, Balance Sheet Account, Balance of Payments |
1. With reference to diet, positive balance is a net gain to the body and negative balance a net loss from the body. When intake equals excretion the body is in equilibrium or balance with respect to the nutrient in question. Used in reference to nitrogen (protein), mineral salts, and energy.
2. A balanced diet is one containing all nutrients in appropriate amounts.
1. The ability to maintain a stable position while either stationary (static balance) or moving (dynamic balance). Balance is achieved by the action of reflexes involving the eyes, the balance organs in the semi-circular canals of the ears, pressure receptors in the skin (particularly on the soles of the feet), and stretch receptors in muscles and joints. Good balance is needed for many sports, especially those requiring sudden changes in movement, such as gymnastics and tennis.
2. The harmonious development of physical, mental, and spiritual aspects of a person. Balance was a philosophical ideal of the ancient Greeks who believed that sport played a key role in its acquisition.
Balance or equilibrium, is a state in which opposing tendencies are equal. To balance an object means to position it with its centre of gravity above its supports in such a way that there is no tendency for it to topple over to one side rather than to another. Toppling is not the same as falling. It is the toppling motion that gives rise to the ‘sensation of loss of balance’ and one feels ‘balanced’ when such sensations do not occur. We say that someone has a ‘good sense of balance’ when they appear able to move freely in all sorts of circumstances without obvious signs of accidental toppling. An object topples when the resultant of the stress forces acting on it does not pass through its centre of gravity (c of g). Stress forces are the forces of common experience—pushing and pulling—which are always associated with deformation of the molecular architecture of objects in contact. Gravity, on the other hand, is something quite different. It is the force to which Newton attributed the observed accelerations of objects in free fall. It acts at a distance, without contact. It is not gravity that breaks an egg when you drop it, but the stress forces on impact. The egg remains perfectly intact while it is in free fall under the action of gravity. An object can be prevented from falling if it is supported by stress forces exerted at contact with other objects, which are themselves supported in turn on the solid crust of the planet.
An object is said to be in ‘stable equilibrium’ if any small perturbation generates a force to oppose the displacement. This will be the case if the projection of the c of g falls within an ‘area of support’, defined as that polygon, with no re-entrant angles, that just encloses the projections of all the available points of support. Balance is maintained by moving the resultant of the supporting forces about in such a way as to resist perturbations. A piece of furniture, such as a table standing on its legs, is stable because, if any attempt is made to tilt it, the support thrusts in the legs alter and their resultant consequently shifts to resist the tilting. If you stand on one leg and pay attention to your standing foot, you will be able to feel changes in the foot as muscular forces alter the position of the thrust exerted between the foot and the ground to compensate for and resist the inevitable swaying arising from movements of the heart and chest.
Role of proprioception
sensory receptors of several kinds are involved in the complex process of maintaining uprightness, as well as in the recognition of the imminence of toppling. There are no ‘gravity receptors’ as such, in spite of what is generally believed. The parts of the inner ear commonly associated with this function turn out to be accelerometers; i.e. they are detectors of stress gradient, not of gravity. Proprioceptors elsewhere in the body can also act as accelerometers and thus make a contribution to indicating the direction of the resultant support thrust. The actual position of the thrust line is indicated by deformation of the soft tissues of the feet and hands at the areas of contact with the supports. Movements of the head during overbalancing are indicated by the streaming of details in the images of the environment on the peripheral retina.
Stability
Restricting the area of support diminishes the available range through which the support thrust can be moved to resist perturbations, unless the position of the support is itself appropriately moved by the perturbation. When an egg is placed on a hard surface, the area of support is restricted to the very small area of contact. It is, accordingly, very hard to balance an egg on one end, because any accidental tilting produces more movement of the c of g than of the point of support, the centre of curvature of the shell at the ends being below the c of g of the egg. The shift of the thrust line, which necessarily passes through the area of support, is thus not sufficient to correct the tilt. With the egg on its side, however, a brief push in the direction of the long axis of the egg produces temporary rocking, followed by a return to the original position. The centre of curvature in the plane of the long axis is above the c of g, so the shift of the thrust line exceeds that of the c of g. For a sideways perturbation, the centre of curvature is coincident with the c of g, and the egg just rolls away from the perturbation, with the thrust line continuing to pass through the c of g. This is what happens to a wheel: the balance is neither stable nor unstable.
If the body of an animal or of a person is to stay in more or less the same place, any accidental displacement in a particular direction will have to be corrected by a corresponding displacement in the opposite direction. This is achieved by adjusting, by muscular forces, the thrust forces exerted by the limbs against the supports — in magnitude, in direction, in timing, and in point of application.
Anticipatory pre-emptive actions
A number of reflex reactions have been identified that produce the appropriate changes in the musculature, by swaying, hopping, and stepping. In the intact subject, however, many of these reflexes are effectively replaced by ‘anticipatory pre-emptive actions’. These are voluntary actions, based on the underlying reflexes, but initiated in response to the detection that the incoming sensory information is changing in a way that might lead to a need for corrective action. Appropriate action is initiated early, before the reflex responses themselves are triggered into action. Frequent rehearsal, from a very early age, leads to these voluntary actions being performed without the subject being aware of what is going on—that is to say, they become habits. Their promptness plays an important role in maintaining smoothness of control, since they are not subject to the delays inevitable in reflex responses.
Overbalancing
The erect posture of man, particularly when standing on one leg, is a condition of precarious equilibrium, because the area of support is small compared with the height of the c of g above the feet. The strategies for avoiding falling over are related to what happens to an egg placed on its side. Small perturbations are met by shifting the centre of pressure at the foot and thus developing an inclined thrust to oppose the perturbation, as in the egg displaced in the direction of its long axis. This strategy will fail when the thrust line reaches the edge of the area of support, because further displacement will cause the body to topple. The imminence of such toppling is detected by the proprioceptive system and a different strategy is brought into play. If another limb is available, it will be thrust out in the direction of the impending fall in a ‘rescue reaction’ that attempts to find a firm obstacle against which to develop force and thus to extend the effective area of support. This is the basis of stepping. A succession of steps, in locomotion, brings the legs into action in turn, like the spokes of a wheel, so that the body may be moved through an indefinite distance without falling over—like the egg being rolled sideways. The legs do not provide the same continuous support as a wheel because, when one leg is being swung forward in a step, the body topples forward over the stance leg and acquires some downward momentum. This toppling movement has to be corrected when the swing leg eventually touches down, so this leg then at first gives, to absorb the unwanted momentum, and later straightens again to restore the c of g to its earlier height above the ground. As the body continues to move forward over the new stance foot, that leg extends to provide extra thrust, which propels the body forward into the next step. If this thrust is strong enough, the body can be launched into a free fall phase while the free leg is still swinging. This extends the step length, as in running or jumping.
Uprightness
When an object is at rest on a stationary support, the thrust line is parallel to a radius of the planet, i.e. it lies in the gravitational vertical. Experiments with moving platforms reveal, however, that the direction of the thrust line appropriate to the avoidance of falling over is dependent on the accelerations associated with the movement of the platform. A person standing in a vehicle that is moving in a curved path has to lean inwards, to develop a horizontal component of thrust to accelerate his body into an equally curved path, as well as developing an upward thrust to prevent falling. The best direction for the thrust line is thus not the same as the gravitational vertical.
The thrust developed against the supports, both on moving platforms and on firm ground, is under continuous readjustment by the nervous system to suit the needs of the moment, be it to remain in one place or to move about in locomotion or athletic activity. The successful control of the necessary muscular activity is a matter of skill; the basis of this is first acquired in infancy and it is continually being revised and rehearsed throughout life as different types of activity are undertaken.
— T. D. M. Roberts
Bibliography
See also posture; proprioception; sensory receptors; walking.
noun
verb
In addition to the idiom beginning with balance, also see checks and balances; hang in the balance; off balance; on balance; redress the balance; strike a balance; tip the balance.
Definition: composure
Antonyms: imbalance, noncomposure
n
Definition: equilibrium
Antonyms: disproportion, imbalance, instability
v
Definition: compare
Antonyms: unbalance
v
Definition: make equal; cause to have equilibrium
Antonyms: disproportion, overbalance, unbalance
n. the ability of a boat to stay on course without adjustment of the rudder.
balance of power
1. a situation in which nations of the world have roughly equal power.
2. the power held by a small group when larger groups are of equal strength.
See the Introduction, Abbreviations and Pronunciation for further details.
A term used in classical ballet to denote a rocking step that transfers weight from one foot to the other, usually in 3/4 time.
1. The ability to maintain a stable and specific orientation in relation to the immediate environment. Static balance refers to the ability to hold a stationary position; dynamic stability is the ability to maintain equilibrium while moving. Balance is maintained by multiple reflexes involving the eyes, semi-circular canals, and other structures in the ear, pressure receptors in the skin (particularly on the soles of the feet), and muscle proprioceptors. Good balance is a feature of successful performance in many sports, especially those such as gymnastics, which require sudden changes in movement.
2. The harmonious development of physical, mental, and spiritual aspects of a person. Balance was a philosophical ideal of the ancient Greeks who thought that sport played a key role in the acquisition of balance
3. A device that measures weight.
Types of Balances
The Equal-Arm Balance
The simplest type of balance, the equal-arm, or beam, balance, is an application of a lever. A uniform bar, the beam, is suspended at its exact center on a knife-edge set at right angles to it. The point of support is called the fulcrum. Two pans of equal weight are suspended from the beam, one at each end, at points equidistant from the fulcrum. Since the center of gravity of a uniform bar is at its midpoint, the beam supporting the pans will be in equilibrium, i.e., will balance on the knife-edge. A long pointer attached at right angles to the beam at the fulcrum indicates zero on a scale when the beam is at rest parallel to a level surface. It shows also the extent of swing of the beam on one side or the other, acting somewhat as a pendulum, when the beam is coming to rest. The object to be weighed is placed on one pan, and standard weights are added to the other until the balance of the beam is established again. The unknown weight can then be determined by adding up the standard weights in the pan.
The platform balance is a form of equal-arm balance in which two flat platforms are attached to the top side of the beam, one at each end. Such a balance has a rider, or weight, mounted on a bar that has a calibrated scale, is parallel to the beam, and connects the supports of the two platforms. This rider is moved along the bar, its edge marking decimal fractions of the unit weight.
The Unequal-Arm Balance
On the unequal-arm balance the beam is suspended at a point a very short distance from one of its ends. The object to be weighed is placed on this end, and a small known weight is moved out along the longer arm until balance is obtained. The unknown weight is then determined by using a formula involving the known weight and the distance of each weight from the fulcrum. One example of this type of balance is the steelyard, an ancient device still used in underdeveloped nations because of its portability and low cost; since the difference in length of the arms can multiply the effect of the smaller weight by a factor of 100 or more, a small steelyard hung from a tree can be used, for example, to weigh a side of beef.
The Spring Balance
A spring balance consists of a coiled spring fixed to a support at one end, with a hook at the other to which the body to be weighed is applied. Within the spring's limit of elasticity, the distance through which it is stretched is directly proportional to the weight of the applied body. A pointer and graduated scale attached to the spring convert this distance into a weight reading.
Accuracy of Balances
Although extremely accurate results can be obtained in measuring the weights of minute objects, it is physically impossible to construct any balance perfect enough to yield absolutely accurate determinations. For example, the analytical balance, a type of equal-arm balance, is used for delicate weighing in quantitative chemical analysis and in preparing pharmaceutical prescriptions; it must be kept in a glass case, since its accuracy is easily affected by dust and moisture. A spring balance does not retain its accuracy permanently, for no matter how carefully it is handled, the spring very gradually uncoils even though its limit of elasticity has not been exceeded.
For ordinary purposes the errors are so small that they are considered insignificant, but in chemical analysis it has been necessary to develop methods by which they can be further minimized. A so-called torsion balance, which depends on the twisting of a wire or thread, is employed for weighing, but the term is commonly used to indicate a device for measuring minute electrical and magnetic forces.
See scale.
(DOD) A concept as applied to an arms control measure that connotes: a. adjustments of armed forces and armaments in such a manner that one state does not obtain military advantage over other states agreeing to the measure; and b. internal adjustments by one state of its forces in such manner as to enable it to cope with all aspects of remaining threats to its security in a post arms control agreement era.
| bakers' yeast, bait region, bait | |
| balance study, balanced growth, balanced salt solution |
1. an instrument for weighing.
2. harmonious adjustment of different elements or parts; harmonious performance of functions. Used to describe symmetry and proportion of conformation.
1. equilibrium or harmony. n 2. occlusal equilibrium or facial esthetic harmony.

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Balance or balancing may refer to:
In game design, balance is the concept and the practice of tuning relationships between a game's component systems.
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Dansk (Danish)
n. - balance, ligevægt
v. tr. - være i saldo, stemme
v. intr. - afbalancere, afstemme, bringe i balance
idioms:
Nederlands (Dutch)
balans, weegschaal, tegengewicht, evenwicht, overwicht, standvastigheid, saldo, tegoed, opgeld, sluiten, kloppen, balanceren, uitbalanceren, afwegen tegen het evenwicht houden/ verliezen
Français (French)
n. - balance, équilibre, aplomb, (Comm, Fin) solde, report, position (d'un compte), (fig) mesure, (sens) des proportions, reste, régulateur, balancier
v. tr. - équilibrer, se tenir en équilibre, mettre/poser en équilibre, (fig) équilibrer, compenser, balancer, peser, comparer, compenser (une valeur, une somme), contrebalancer, s'équilibrer, (Comm, Fin) arrêter (un compte), dresser (un bilan)
v. intr. - se faire contrepoids, se maintenir en équilibre, être en équilibre, (Comm, Fin) s'équilibrer, se maintenir en équilibre (des comptes)
idioms:
Deutsch (German)
v. - stimmen, balancieren, ausgleichen, ausbalancieren, auswuchten, aufwiegen
n. - Waage, Gleichgewicht, Ausgewogenheit, Bilanz, Saldo
idioms:
Ελληνική (Greek)
v. - ισορροπώ, ισοσκελίζω/-ομαι, κλείνω (τα βιβλία), ισοσταθμίζω, αντισταθμίζω, ισοφαρίζω, ζυγίζω, σταθμίζω, εξοφλώ, εξισώνω/-ομαι
n. - ισορροπία, ζυγαριά, πλάστιγγα, υπόλοιπο, υπόλοιπο τραπεζικού λογαριασμού, ισοζύγιο, ισολογισμός, (αστρολ.) Ζυγός, ίσος χρόνος τηλεοπτικής αντιπαράθεσης
idioms:
Italiano (Italian)
soppesare, equilibrarsi, bilanciare, compensare, bilancia, equilibrio, stabilità, bilancio, credito
idioms:
Português (Portuguese)
v. - pesar, comparar, equilibrar, saldar, oscilar
n. - balança (f), equilíbrio (m), firmeza (f), estimativa (f), balanço (m), restante (m)
idioms:
Русский (Russian)
находиться в состоянии равновесия, взвешивать, уравновешивать, весы, баланс, уравновешенность
idioms:
Español (Spanish)
n. - balance, balanza, báscula, peso, equilibrio, balance general, estado de cuentas, saldo, resultado
v. tr. - cuadrar, equilibrar, balancear, nivelar, compensar
v. intr. - equilibrarse, guardar el equilibrio, poner en equilibrio, ponerse en equilibrio, balancearse
idioms:
Svenska (Swedish)
v. - avväga, balansera, bringa i jämvikt, uppväga
n. - balansvåg, vågskål, saldo, balans, rest
中文(简体)(Chinese (Simplified))
平衡, 均衡, 平静, 镇定, 协调, 和谐, 天平, 秤, 使平衡, 权衡, 比较, 保持...的平衡, 使相称, 得到平衡, 相称, 保持平衡, 被抵消
idioms:
中文(繁體)(Chinese (Traditional))
n. - 平衡, 均衡, 平靜, 鎮定, 協調, 和諧, 天平, 秤
v. tr. - 使平衡, 權衡, 比較, 保持...的平衡, 使相稱
v. intr. - 得到平衡, 相稱, 保持平衡, 被抵消
idioms:
한국어 (Korean)
n. - 저울, 조화
v. tr. - ~의 균형을 잡다, ~을 비교하다
v. intr. - 균형이 잡히다, 주저하다
idioms:
日本語 (Japanese)
n. - つり合い, バランス, 平静, 天びん, 残り, 差し引き, 残高, 評価
v. - つり合いをとる, つり合わせる, 収支を一致させる, 合う, 比較する, つりあう
idioms:
العربيه (Arabic)
(فعل) يثبت, يتوازن (الاسم) ميزان, قسطاس, , رصيد, موازنه
עברית (Hebrew)
n. - מאזניים, שיווי-משקל, יציבות, יתרה, מאזן
v. tr. - שקל, השווה, איזן
v. intr. - התאזן
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