Weighing scale
From The Art and Popular Culture Encyclopedia
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A weighing scale (usually just "scales" in UK and Australian English, or "scale" in US English) is a measuring instrument for determining the weight or mass of an object. A spring scale measures weight by the distance a spring deflects under its load. A balance compares the torque on the arm due to the sample weight to the torque on the arm due to a standard reference weight using a horizontal lever. Balances are different from scales, in that a balance measures mass (or more specifically gravitational mass), whereas a scale measures weight (or more specifically, either the tension or compression force of constraint provided by the scale). Weighing scales are used in many industrial and commercial applications, and products from feathers to loaded tractor-trailers are sold by weight. Specialized medical scales and bathroom scales are used to measure the body weight of human beings.
See also
- Ampere balance
- Apparent weight
- AutoAnalyzer
- Libra
- Mass versus weight
- Multihead weigher
- Combination weigher
- Nutrition scale
- Roberval Balance
- Steelyard balance
- Tare weight
- Watt balance
- Weigh house - historic public building for the weighing of goods
- Weigh lock - for weighing canal barges
- Weighbridge - for weighing vehicles (such as trucks) and railcars