Weighing scale | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-10

This is an audio version of the Wikipedia Article:
Weighing scale


00:01:07 1 Balance scales
00:01:16 1.1 History
00:04:18 1.2 Mechanical balances
00:07:37 1.2.1 Roberval balance
00:09:11 1.3 Electronic devices
00:09:20 1.3.1 Microbalance
00:09:38 1.3.2 Analytical balance
00:11:12 1.3.3 Pendulum balance scales
00:11:36 1.4 Symbolism
00:12:04 2 Force-measuring (weight) scales
00:12:15 2.1 History
00:13:19 2.2 Mechanical scales
00:13:46 2.2.1 Spring scales
00:15:39 2.2.2 Hydraulic or pneumatic scale
00:16:05 2.3 Digital scales
00:17:06 2.3.1 Digital bathroom scale
00:17:46 2.3.2 Digital kitchen scale
00:18:03 2.3.3 Strain gauge scale
00:18:39 2.3.4 Supermarket and other retail scale
00:19:33 2.4 Testing and certification
00:21:42 2.4.1 Sources of error
00:23:11 3 Hybrid spring and balance scales
00:23:21 3.1 Elastic arm scale



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SUMMARY
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A weighing scale (or weighing balance) is devices to measure weight or mass. They are also known as mass scales, weight scales, mass balance, weight balance, or simply scale, balance, or balance scale.
The traditional scale consists of two plates or bowls suspended at equal distance of a fulcrum. One plate holds an object of unknown mass (or weight), while known masses are added to the other plate until static equilibrium is achieved and the plates level off, which happens when the mass on each plates is equal. A spring scale will make use of a spring of known stiffness to determine mass (or weight). Suspending a certain mass will extend the spring by a certain amount depending on the spring's stiffness (or spring constant). The heavier the object, the more the spring stretches, as described in Hooke's law. Other types of scale making use of different physical principles also exist.
Some of scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms. Scales and balances are widely used in commerce and many are sold and packaged by mass.