# What is the Formula for Percent Error?

Percent error is a term used to describe the difference between an experimental or measured value and an accepted or known value. It can be a positive or negative number and is often used in chemistry, physics and other sciences. It is calculated by subtracting the actual or experimental value from the accepted or known one, divided by the theoretical value and multiplied by 100.

#### What is the formula for percent error?

The formula for percent error can be found in many textbooks, but it can be confusing to some people. It is important to understand what the formula means, how to use it and why it is used. It can also help you know when to drop the sign on a calculation and report your answer with the correct number of significant figures.

Firstly, there are several symbols in the percent error formula that show absolute values. These symbols can be helpful because they change a negative number to a positive one and make it easier for you to see what you are looking at. They are also a good way to check for errors and get an accurate result.

First, you will need to determine the value you are trying to compare between. This may be an accepted value, a theoretical value, an approximate value or an experimental value, depending on the context.

You will need to find the variance between them (the difference between the actual value and the theoretical or exact one). To do this, you must disregard any negative signs.

Next, you will need to divide the variance between them by the absolute true value or exact value. To do this, you will need to ignore any negative signs that appear.

Once you have this value, you can then multiply it by 100 and add a % symbol to express your percentage as a number. You can then use this number to compare the estimated and actual value to determine how close your guess was to the actual one.

Another thing to consider is the amount of time you have to perform the experiment. If you have limited time, you can decrease the amount of work you need to do in order to get the results you are after. This can be particularly useful if you are using an unreliable or inaccurate instrument to measure the experiment.

Finally, you can use the resulting percentage to determine how close your measurements were to the real value. For example, if you are measuring the density of copper and you get a value that is much higher than the accepted value for copper, this could indicate that your measurements are not as accurate as they should be.

Percent error is a relatively easy equation to understand, but it can be tricky to calculate correctly. If you are having trouble with it, it can be beneficial to seek professional assistance from a Chegg tutor. Our experts are available around the clock and will provide you with a customized solution to your problem.