name five tools to measure mass
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Instruments Used to Measure Mass (Weight)
All scales make use of the acceleration of earth’s gravity to measure mass. This acceleration produces a downward force that must be counteracted in some way as described in this list of instruments:
Direct mass measurement
Some scales, such as the traditional beam balance, measure mass directly by counteracting the downward force by another equal downward force on the opposite side of the pivot. On a beam balance, you add enough mass to the opposite pan to counterbalance the unknown mass. No force is measured. This type of instrument automatically compensates for differences in the acceleration of gravity at different locations on earth. If you brought this type of scale to the moon, you would still get the same answer as on earth. Unfortunately, this type of scale does not lend itself to automatic operation and is rarely used any more.
Load Cell Instruments for mass measurement
Strain gage load cell instruments The most common types of instruments use strain gage load cells with typical accuracy of one part in 2000. These scales lend themselves to computer interfacing at relatively low cost. Pulsed DC power supplies and linearization circuits have allowed accuracies to one part in 5000 at higher cost.
Frequency shift technology instruments The next level of price with improved accuracy comes with new ceramic capacitive strain gages (“accuracy” is here defined as as the ratio between uncertainty and load capacity). These scales can be made with accuracies up to one part in 30,000. Transducer stiffness is comparable with strain gage beam cells. These transducers have one drawback: they can be damaged if a hard object is dropped on the scale, since the ceramic spring is brittle and cannot withstand shock. Some newer scales using this technology incorporate spring shock dampers to minimize this problem.
Force restoration instruments The biggest innovation has been the application of force restoration technology to weight measurement. The newest generation of electronic force re-balance transducers in modern instruments can achieve accuracies on the order of one part in 10 million in laboratory balances. In the more common bench scale ranges up to 25 lb, the accuracy can approach one part in 1 million. In the larger sizes, 75 to 13,000 lb, accuracies are typically one part in 25,000 to one part in 50,000. At this time, the maximum load ratings of commercial instruments available are on the order of 13,000 lb. Special devices have much larger capacities. Some high accuracy force measuring scales now are designed with a built-in calibration weight which compensates for the change in the acceleration of gravity. These scales are highly programmable to accommodate many weighing conditions. These include settings which vary: stability (i.e. animal weighing), parts counting on weight basis, selectable units of measurement, and they are fully compatible with computer interfacing. The disadvantages are price, and slower response time.
List of Weight Scale Characteristics The table below compares instrument types with the three transducer types described above. Relative cost is a comparison of the cost of a given scale to a no-frills strain gage scale of the same load capacity.
Answer:
Tools to measure mass
Explanation:
Units Used to degree Mass (Weight)
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Direct mass size
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Load cellular built-indevices for mass dimension
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