# Weighing scale

scalesscalebalancebalance scaleweighing scalesbathroom scalebeam balancebalance scalesbalancesdigital scale
A weighing scale (or weighing balance) is a device to measure weight or mass.wikipedia
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### Steelyard balance

steelyardsteelyards
To determine the mass of the object, a combination of reference masses was hung on one end of the beam while the object of unknown mass was hung on the other end (see balance and steelyard balance).
A steelyard balance, steelyard, or stilyard is a straight-beam balance with arms of unequal length.

### Mass

inertial massgravitational massweight
A weighing scale (or weighing balance) is a device to measure weight or mass.
In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses.

### Spring scale

spring balancespring scales
A spring scale measures mass by reporting the distance that a spring deflects under a load.
A spring scale or spring balance or newton meter is a type of weighing scale.

### Vented balance safety enclosure

vented balance enclosureschemical hoods
The use of a mechanically vented balance safety enclosure, which has uniquely designed acrylic airfoils, allows a smooth turbulence-free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product.
Vented balance safety enclosures are used in pharmaceutical, chemical, biological, and toxicological laboratories to provide maximum containment for weighing operations in weighing scales.

### Kilogram

kgmgmilligram
Some scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms.
Because at any given point on Earth the weight of an object is proportional to its mass, the mass of an object in kilograms is usually measured by comparing its weight to the weight of a standard mass, whose mass is known in kilograms, using a device called a weighing scale.

Justicescales of justiceblind justice
The scales (specifically, a two-pan, beam balance) are one of the traditional symbols of justice, as wielded by statues of Lady Justice.
The personification of justice balancing the scales dates back to the goddess Maat, and later Isis, of ancient Egypt.

### Force

forcesattractiveforce vector
Spring scales measure force, which is the tension force of constraint acting on an object, opposing the local force of gravity. They are usually calibrated so that measured force translates to mass at earth's gravity.
A static equilibrium between two forces is the most usual way of measuring forces, using simple devices such as weighing scales and spring balances.

### International Organization of Legal Metrology

OIMLInternational Organization of Legal Metrology (OIML)Convention establishing an International Organization of Legal Metrology
In the USA, the scales are certified by the National Type Evaluation Program (NTEP), in South Africa by the South African Bureau of Standards and in the UK by the International Organization of Legal Metrology.
Such products include weighing devices, taxi meters, speedometers, agricultural measuring devices such as cereal moisture meters, health related devices such as exhaust measurements and alcohol content of drinks.

### Gilles de Roberval

RobervalGilles Personne de Robervalde Roberval, Gilles
In 1669 the Frenchman Gilles Personne de Roberval presented a new kind of balance scale to the French Academy of Sciences.
As results of Roberval’s labours outside of pure mathematics may be noted a work on the system of the universe, in which he supports the Copernican heliocentric system and attributes a mutual attraction to all particles of matter and also the invention of a special kind of balance, the Roberval Balance.

### Calibration

calibratedcalibratecalibrating
Some scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms. Spring scales measure force, which is the tension force of constraint acting on an object, opposing the local force of gravity. They are usually calibrated so that measured force translates to mass at earth's gravity.
The term "calibration" was likely first associated with the precise division of linear distance and angles using a dividing engine and the measurement of gravitational mass using a weighing scale.

### Roberval balance

balance design
Roberval balance
The Roberval balance is a weighing scale presented to the French Academy of Sciences by the French mathematician Gilles Personne de Roberval in 1669.

### Weigh house

Waagweighing houseweigh-house
Weigh house - historic public building for the weighing of goods
Weigh houses were especially common in the Netherlands, Germany, where they are called waag and waage respectively (both meaning "scale") and Poland (waga miejska, "town/city scales", as in Cracow and Posen).

### Auncel

Auncel
The auncel ( or aunsell’, lit. "little balance") was a balance scale formerly used in England.

### Truck scale

weighbridgeweigh bridgetruck scales
The results from several supporting locations may be added electronically, so this technique is suitable for determining the mass of very heavy objects, such as trucks and rail cars, and is used in a modern weighbridge.
A Truck scale (US), weighbridge (non-US) or railroad scale is a large set of scales, usually mounted permanently on a concrete foundation, that is used to weigh entire rail or road vehicles and their contents.

### Ampere balance

current balance
Ampere balance
The current to be measured is passed in series through two coils of wire, one of which is attached to one arm of a sensitive balance.

### Weight

gross weightweighingweigh
A weighing scale (or weighing balance) is a device to measure weight or mass.
In a uniform gravitational field, the gravitational force exerted on an object (its weight) is directly proportional to its mass. For example, object A weighs 10 times as much as object B, so therefore the mass of object A is 10 times greater than that of object B. This means that an object's mass can be measured indirectly by its weight, and so, for everyday purposes, weighing (using a weighing scale) is an entirely acceptable way of measuring mass. Similarly, a balance measures mass indirectly by comparing the weight of the measured item to that of an object(s) of known mass. Since the measured item and the comparison mass are in virtually the same location, so experiencing the same gravitational field, the effect of varying gravity does not affect the comparison or the resulting measurement.

### Triple beam balance

triple beam balances
Types of mechanical scale include spring scales, hanging scales, triple beam balances and force gauges.
Weighing scale

### Gouy balance

Gouy balance
In use, a long, cylindrical sample to be tested is suspended from a balance, partially entering between the poles of a magnet.

### Tare weight

tareemptytare mass
Tare weight
Tare weight is accounted for in kitchen scales, analytical (scientific) and other weighing scales which include a button that resets the zero of the scale display when an empty container is placed on the weighing platform, in order to subsequently display only the weight of the contents of the container.

### Mass versus weight

weightdistinctionhistorical conflation of mass and weight
Mass versus weight
When one stands on a balance-beam-type scale at a doctor’s office, they are having their mass measured directly.

### Spring (device)

A spring scale measures mass by reporting the distance that a spring deflects under a load. A spring scale will make use of a spring of known stiffness to determine mass (or weight).

### Stiffness

flexibilityrigidityrigid
A spring scale will make use of a spring of known stiffness to determine mass (or weight).

### Hooke's law

spring constantforce constantelasticity tensor
Suspending a certain mass will extend the spring by a certain amount depending on the spring's stiffness (or spring constant).

### Newton (unit)

kNnewtonN
Some scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms.

### Chu (state)

ChuState of ChuChu state
In China, the earliest weighing balance excavated was from a tomb of the State of Chu of the Chinese Warring States Period dating back to the 3rd to 4th century BC in Mount Zuojiagong near Changsha, Hunan.