Weighing scale

scalesscalebalancebalance scaleweighing scalesbalance scalesbalancesbathroom scalebeam balanceweighing machines
A Beam balance (or Beam scale) 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 Beam balance (or Beam scale) 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.

Lever

fulcrumpivotlevers
The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum.
The earliest evidence of the lever mechanism dates back to the ancient Near East circa 5000 BC, when it was first used in a simple balance 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.

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 mechanical force gauge or weighing scale.

Lady Justice

JusticeJustitiascales of 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.

Libra (astrology)

LibraBalanceLibra/Tula
Scales are also the symbol for the astrological sign Libra.
The symbol of the scales is based on the Scales of Justice held by Themis, the Greek personification of divine law and custom.

International Organization of Legal Metrology

OIMLConvention establishing an International Organization of Legal MetrologyInternational Organization of Legal Metrology (OIML)
In the US, 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.

Force

forcesattractiveelastic force
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.

Gilles de Roberval

Gilles Personne de RobervalRobervalde 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.

Auncel

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

Calibration

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

Truck scale

weighbridgeweigh bridgeweighing bridge
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 balanceKelvin 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 Beam balance (or Beam scale) 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.

Gouy balance

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

Triple beam balance

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

Tare weight

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

Mass versus weight

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

Spring (device)

springspringsspring-loaded
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.