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# instrument used to measure weight of a person

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 masses on the two plates are equal. Weighing scales use a spring with a known spring constant (see Hooke's law) and measure the displacement of the spring by any variety of mechanisms to produce an estimate of the gravitational force applied by the object. The particular instrument in a health care provider's office used to measure standing height is a stadiometer. A strain gauge is a conductor whose electrical resistance changes when its length changes. When measuring small amounts of capacity, you can use a graduated cylinder. BMI is a person’s weight in kilograms divided by the square of height in meters. You can use metric rulers to measure in millimeters, centimeters, and meters. Spring scales measure force, which is the tension force of constraint acting on an object, opposing the local force of gravity. [clarification needed][citation needed]. 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). [17] Rack and pinion mechanisms are often used to convert the linear spring motion to a dial reading. [16] They are usually calibrated so that measured force translates to mass at earth's gravity. Prior to that, no banking was performed due to lack of scales. Source: WayfairDon’t knock the kitchen scale. Some scales can be calibrated to read in units of force (weight) such as newtons instead of units of mass such as kilograms. A person is at high risk for signs of illness and diminished work capacity when the BMI first drops below ____. An example of application of this design are scales made by the Toledo Scale Company.[12]. Further developments have included a "gear balance" in which the parallelogram is replaced by any odd number of interlocking gears greater than one, with alternating gears of the same size and with the central gear fixed to a stand and the outside gears fixed to pans, as well as the "sprocket gear balance" consisting of a bicycle-type chain looped around an odd number of sprockets with the central one fixed and the outermost two free to pivot and attached to a pan. Measurement refers to the assignment of numbers in a meaningful way, and understanding measurement scales is important to interpreting the numbers assigned to people, objects, and events. These can also measure weight between $$\text{0}$$ and $$\text{150}$$ $$\text{kg}$$. Even with all the advances in weighing scale design and development, all scales until the seventeenth century AD were variations on the balance scale. These are also known as mass scales, weight scales, mass balances, weight balances, or simply scales, balances, or balance scales. [1] In its traditional form, it consists of a pivoted horizontal lever with arms of equal length – the beam – and a weighing pan[7] suspended from each arm (hence the plural name "scales" for a weighing instrument). Gravitational differences for a scale which measures force, but not for a balance. A digital scale calculates the person’s mass by taking the body weight and dividing it by gravity. Monthly: Scales and stadiometers should be calibrated monthly. In most cases, these types of scales have a sealed calibration so that the reading on the display is correct and cannot be tampered with. Scales and balances are widely used in commerce, as many products are sold and packaged by mass. Scales are also the symbol for the astrological sign Libra. They usually have a tare feature that makes it easy to continually weigh ingredients in the same bowl without having to dirty other bowels or dump out the bowl being used. Strain gauges have limited capacity and larger digital scales may use a hydraulic transducer called a load cell instead. A digital scale or an adult beam balance scale with a step-on platform and attached sliding weights are appropriate to use to weigh children and adults. Scales (specifically, a two-pan, beam balance in a state of equal balance) are the traditional symbol of Pyrrhonism indicating the equal balance of arguments used in inducing epoche.[13]. How to Measure and Interpret Weight Status Adult Body Mass Index or BMI. One element is required to discriminate the object and sense its dimensions or frequency. Such designs have reduced the service problems inherent with combining and transmitting a number of 20 millivolt signals in hostile environments. Although no actual scales from this era have survived, many sets of weighing stones as well as murals depicting the use of balance scales suggest widespread usage. Weighing dishes from the island of Thera, Minoan civilization, 2000–1500 BC, Assyrian lion weights (8th century BC) in the British Museum, Roman balance with two bronze weights, 50-200 A.D., Gallo-roman museum, Tongres Belgium. Although BMI is often considered an indicator of body fatness, it is a surrogate measure of body fat because it measures excess weight rather than excess fat. Recumbent length can also used for children two to three years of age who have great difficulty standing on their own; these children must be measured lying down and the measurement should be recorded as recumbent length. Measure length or acceleration weights – was a factor in sculpting these cubes energy content foods. 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