What instrument is more accurate than ruler?

For example, a standard ruler can measure length to the nearest millimeter, while a caliper can measure length to the nearest 0.01 millimeter. The caliper is a more precise measuring tool because it can measure extremely small differences in length.

learn.saylor.org - Precision of Measuring Tools and Significant Figures - Saylor Academy

Who is Lisa Witt?

Lisa Witt is known around the world as that upbeat piano teacher on YouTube. But did you know that she's also an artist who writes original songs?...

Last updated Sep 3, 2018

What are the 5 black keys on a piano called?

sharps and flats The colour of piano keys The pattern layout is made up of seven white keys and five black keys. The same pattern is then repeated...

Last updated May 26, 2021

Promotion

Figure 1.22 A double-pan mechanical balance is used to compare different masses. Usually an object with unknown mass is placed in one pan and objects of known mass are placed in the other pan. When the bar that connects the two pans is horizontal, then the masses in both pans are equal. The "known masses" are typically metal cylinders of standard mass such as 1 gram, 10 grams, and 100 grams. Figure 1.23 Many mechanical balances, such as double-pan balances, have been replaced by digital scales, which can typically measure the mass of an object more precisely. Whereas a mechanical balance may only read the mass of an object to the nearest tenth of a gram, many digital scales can measure the mass of an object up to the nearest thousandth of a gram

Accuracy and Precision of a Measurement

Science is based on observation and experiment - that is, on measurements. Accuracy is how close a measurement is to the correct value for that measurement. For example, let us say that you are measuring the length of standard computer paper. The packaging in which you purchased the paper states that it is 11.0 inches long. You measure the length of the paper three times and obtain the following measurements: 11.1 in., 11.2 in., and 10.9 in. These measurements are quite accurate because they are very close to the correct value of 11.0 inches. In contrast, if you had obtained a measurement of 12 inches, your measurement would not be very accurate. The precision of a measurement system refers to how close the agreement is between repeated measurements (which are repeated under the same conditions). Consider the example of the paper measurements. The precision of the measurements refers to the spread of the measured values. One way to analyze the precision of the measurements would be to determine the range, or difference, between the lowest and the highest measured values. In that case, the lowest value was 10.9 in. and the highest value was 11.2 in. Thus, the measured values deviated from each other by at most 0.3 in. These measurements were relatively precise because they did not vary too much in value. However, if the measured values had been 10.9, 11.1, and 11.9, then the measurements would not be very precise because there would be significant variation from one measurement to another. The measurements in the paper example are both accurate and precise, but in some cases, measurements are accurate but not precise, or they are precise but not accurate. Let us consider an example of a GPS system that is attempting to locate the position of a restaurant in a city. Think of the restaurant location as existing at the center of a bull's-eye target, and think of each GPS attempt to locate the restaurant as a black dot. In Figure 1.24, you can see that the GPS measurements are spread out far apart from each other, but they are all relatively close to the actual location of the restaurant at the center of the target. This indicates a low precision, high accuracy measuring system. However, in Figure 1.25, the GPS measurements are concentrated quite closely to one another, but they are far away from the target location. This indicates a high precision, low accuracy measuring system. Figure 1.24 A GPS system attempts to locate a restaurant at the center of the bull's-eye. The black dots represent each attempt to pinpoint the location of the restaurant. The dots are spread out quite far apart from one another, indicating low precision, but they are each rather close to the actual location of the restaurant, indicating high accuracy.

Can instrument increase IQ?

Playing musical instruments is not only fun; it is also a great brain exercise. Learning how to play an instrument positively influences your I.Q....

Last updated Nov 25, 2019

Which key cap is best?

Generally, the best keycap style for gaming is the Cherry profile as they are sculpted to be efficient and comfortably pressed. Overall, the keycap...

Last updated May 21, 2020

Promotion

Figure 1.25 In this figure, the dots are concentrated rather closely to one another, indicating high precision, but they are rather far away from the actual location of the restaurant, indicating low accuracy.

Accuracy, Precision, and Uncertainty

The degree of accuracy and precision of a measuring system are related to the uncertainty in the measurements. Uncertainty is a quantitative measure of how much your measured values deviate from a standard or expected value. If your measurements are not very accurate or precise, then the uncertainty of your values will be very high. In more general terms, uncertainty can be thought of as a disclaimer for your measured values. For example, if someone asked you to provide the mileage on your car, you might say that it is 45,000 miles, plus or minus 500 miles. The plus or minus amount is the uncertainty in your value. That is, you are indicating that the actual mileage of your car might be as low as 44,500 miles or as high as 45,500 miles, or anywhere in between. All measurements contain some amount of uncertainty. In our example of measuring the length of the paper, we might say that the length of the paper is 11 in., plus or minus 0.2 in. The uncertainty in a measurement, , is often denoted as ("delta "), so the measurement result would be recorded as . In our paper example, the length of the paper could be expressed as 11 in. .

The factors contributing to uncertainty in a measurement include:

Limitations of the measuring device, The skill of the person making the measurement, Irregularities in the object being measured, Any other factors that affect the outcome (highly dependent on the situation). In our example, such factors contributing to the uncertainty could be the following: the smallest division on the ruler is 0.1 in., the person using the ruler has bad eyesight, or one side of the paper is slightly longer than the other. At any rate, the uncertainty in a measurement must be based on a careful consideration of all the factors that might contribute and their possible effects. Making Connections: Real-World Connections —Fevers or Chills? Uncertainty is a critical piece of information, both in physics and in many other real-world applications. Imagine you are caring for a sick child. You suspect the child has a fever, so you check his or her temperature with a thermometer. What if the uncertainty of the thermometer were ? If the child's temperature reading was (which is normal body temperature), the "true" temperature could be anywhere from a hypothermic to a dangerously high . A thermometer with an uncertainty of would be useless.

Percent Uncertainty

What does 12 8 mean in music?

Meaning that each quarter note beat consisted of a group of three eighth notes (also called an eighth note triplet). With 4 beats and 3 sub-beats...

Last updated May 16, 2020

Can you use simply piano for free?

Simply Piano is available on the iPhone for iOS8 and above and is totally free. It works with any piano or keyboard, including a MIDI keyboard. Sep...

Last updated Mar 24, 2022

Join almost HALF A MILLION Happy Students Worldwide

Pianoforall is one of the most popular online piano courses online and has helped over 450,000 students around the world achieve their dream of playing beautiful piano for over a decade.

Learn More »

Promotion

One method of expressing uncertainty is as a percent of the measured value. If a measurement is expressed with uncertainty, , the percent uncertainty (\%unc) is defined to be

Uncertainties in Calculations

There is an uncertainty in anything calculated from measured quantities. For example, the area of a floor calculated from measurements of its length and width has an uncertainty because the length and width have uncertainties. How big is the uncertainty in something you calculate by multiplication or division? If the measurements going into the calculation have small uncertainties (a few percent or less), then the method of adding percents can be used for multiplication or division. This method says that the percent uncertainty in a quantity calculated by multiplication or division is the sum of the percent uncertainties in the items used to make the calculation. For example, if a floor has a length of and a width of , with uncertainties of and , respectively, then the area of the floor is and has an uncertainty of . (Expressed as an area this is , which we round to since the area of the floor is given to a tenth of a square meter).

This work is licensed under a Creative Commons Attribution 4.0 License.

learn.saylor.org - Precision of Measuring Tools and Significant Figures - Saylor Academy

What is the famous line from the Pirates of the Caribbean?

“Not all treasure's silver and gold, mate.” -Jack Sparrow. More wise words from Captain Jack to help us realize what we truly treasure in life. Jan...

Last updated Jun 22, 2022

Who is Zuckerberg IQ?

152 IQ No one knows what Mark Zuckerberg IQ is since he failed a conventional IQ test. Various sources, however, estimate it at 152 IQ based on...

Last updated Dec 6, 2018

Promotion

What do Shia do that Sunnis don't?

Shiites highly worship Imams and believe that they are sinless and their authority comes from Allah. Sunnis do not support the Imam and do not...

Last updated Sep 1, 2021

Promotion

What instruments do angels use?

The association between angels and harps apparently originates in the Bible, more precisely in chapter 5 of Revelation. “Four angels, along with 24...

Last updated Jan 25, 2020