What determines the sensitivity of a balance?
The sensitivity of a balance depends on several design characteristics as well as the patience of the experimenter. For example, the more stable the design of a balance, the more mass is needed to move the balance noticeably. And the more friction at the locations where movement is required, the less sensitive the balance will be.
What is the sensitivity and precision of a balance?
Sensitivity and Precision. The more sensitive a balance is, the smaller variation in mass the balance can detect and measure. But no balance is prefect. Every balance has its limitations. A real mass smaller than the sensitivity of a balance will not be detectable using the balance.
What is the sensitivity of a torsion balance?
According to Newton's report, the sensitivity of torsion balances are 0.006g, and the smallest readable amount is 0.01g, whereas electronic balances can range from 0.01g to 0.002g.
What is the sensitivity of a balance beam?
The balance beam is most sensitive when its center of gravity lies slightly below its rotation axis. Click to see full answer. Then, how do you find the sensitivity of a balance?
How do you determine the sensitivity of a balance?
Count the number of graph squares that cause the smallest detectable motion. Multiply that number of squares times the calculated mass of a single square to determine the balance's sensitivity.
What is sensitivity of digital balance?
The digital mass balances in the General Chemistry labs are very sensitive instruments used for weighing substances to the milligram (0.001 g) level.
What balance has a higher sensitivity?
Balances for High School: A triple-beam balance is the best all-around mechanical balance with good sensitivity and high capacity. It is easy to use, even for younger children. Order model BS-2610 or the more expensive Ohaus model BS-2611TP.
What is the accuracy of a balance?
The accuracy of the balance relates to the measurement uncertainty of each reading, i.e., the ± tolerance in the result. A fast, stable weighing result is not necessarily an indication of accuracy. A balance that is inaccurate cannot reliably produce repeatable results.
Is an analytical balance sensitive?
Analytical balances are highly sensitive lab instruments designed to accurately measure mass. Their readability has a range between 0.1mg - 0.01mg. Analytical balances have a draft shield or weighing chamber to prevent the very small samples from being affected by air currents.
What is weighing capacity of a balance?
Generally capacity for an analytical balance ranges from 1 g to a few kilograms with precision and accuracy often exceeding one part in 106 at full capacity.
What is class A prescription balance?
Class A Prescription Balance— A balance that meets the tests for this type of balance has a sensitivity requirement of 6 mg or less with no load and with a load of 10 g on each pan. The Class A balance should be used for all the weighing operations required in prescription compounding.
What is least count of balance?
one gramThe least count (the minimum weight that can be weight ) of a physical balance is one gram.
What does a balance measure?
balance, instrument for comparing the weights of two bodies, usually for scientific purposes, to determine the difference in mass (or weight).
What is sensitivity in metrology?
Sensitivity. Sensitivity is an absolute quantity, the smallest absolute amount of change that can be detected by a measurement.
What is the reading error of a weighing balance?
Analytical balance accuracy can only be achieved if the scale operator is consistently alert and careful. Even with alert and careful operators, other factors can influence the analytical balance calibration. In instances where precision is vital, an error of 0.001 grams or even smaller can be quite significant.
What is the uncertainty of an analytical balance?
Generally, uncertainty can be expressed as the sample's weight (the value of measured quantity), the ± sign and the value of the measurement uncertainty itself. So if a balance has an uncertainty measurement of 1mg and you're measuring 10g, the result should be 10±0.01%.
Balance: How does sensitivity work?
Balances are laboratory instruments designed to determine the mass of a body, thus providing accurate data on its weight. Among the many existing models, the analytical balance stands out, which has a high power of rigor, since with it it is possible to obtain great precision and sensitivity.
What does the sensitivity of a balance refer to?
Sensitivity is determined by the ability to accurately determine results for very low or low values, and can be expressed as the difference between extreme values of several measurements of the same magnitude.