percent error how to calculate it. error!. error = measured value – accepted value science...
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![Page 1: Percent Error How to Calculate it. ERROR!. Error = Measured Value – Accepted Value Science references list the density of aluminum as being 2.7g/cm 3](https://reader036.vdocuments.us/reader036/viewer/2022062315/5697bfb61a28abf838c9de3e/html5/thumbnails/1.jpg)
Percent ErrorHow to Calculate it.
ERROR!
![Page 2: Percent Error How to Calculate it. ERROR!. Error = Measured Value – Accepted Value Science references list the density of aluminum as being 2.7g/cm 3](https://reader036.vdocuments.us/reader036/viewer/2022062315/5697bfb61a28abf838c9de3e/html5/thumbnails/2.jpg)
Error = Measured Value – Accepted Value
• Science references list the density of aluminum as being 2.7g/cm3.
• Suppose you perform an experiment and your results show aluminum having a density of 2.8g/cm3
Aluminum 2.7g/cm3
Aluminum 2.8g/cm3
Accepted
Measured
Error = 2.8g/cm3 – 2.7g/cm3 = 0.1g/cm3
Error can be positive or negative but sometimes it isn’t very useful!
![Page 3: Percent Error How to Calculate it. ERROR!. Error = Measured Value – Accepted Value Science references list the density of aluminum as being 2.7g/cm 3](https://reader036.vdocuments.us/reader036/viewer/2022062315/5697bfb61a28abf838c9de3e/html5/thumbnails/3.jpg)
• If you have a 10ft long table (accepted value) and your results state it is 5ft long (measured value) your error is 5ft.
• Goal line to Goal line, a football field is 300 feet (known value). If you measure its length and come up with 290ft your error is 10ft.
• Even though the first measurement was off by only 5ft, the second measurement which is off by 10ft is much better.
• In terms of percentages, the first measurement was off by 50% of the value whereas the second was only off by 3.3%.
Error is 5ft out of 10
Error is 10ft but out of 300ft
You can have an error of a million miles if you were measuring the distance to the sun but it would only be a 1-2% error because the sun is 93 million miles away!
![Page 4: Percent Error How to Calculate it. ERROR!. Error = Measured Value – Accepted Value Science references list the density of aluminum as being 2.7g/cm 3](https://reader036.vdocuments.us/reader036/viewer/2022062315/5697bfb61a28abf838c9de3e/html5/thumbnails/4.jpg)
• Aluminum has an accepted value of 2.7g/cm3.Suppose you perform an experiment and your results show aluminum as having a density of 2.8g/cm3. What is your percent error?
Get a difference.
Compare to Accepted value.
Multiply by 100.
![Page 5: Percent Error How to Calculate it. ERROR!. Error = Measured Value – Accepted Value Science references list the density of aluminum as being 2.7g/cm 3](https://reader036.vdocuments.us/reader036/viewer/2022062315/5697bfb61a28abf838c9de3e/html5/thumbnails/5.jpg)
A student measured the temperature of boiling water and got an experimental reading of 97.5°C. Calculate the % error.
Get a difference.
Compare to Accepted value.
Multiply by 100.