Published on July 7th, 2012 | by BeScientist.info0
What is the difference between accuracy and precision in chemistry?
Hi guys, in this tutorial I am gonna show you guys what is the difference between accuracy and precision in chemistry. In common sense these terms seems interchangeable but in science these terms have their specific meanings and purpose.
Let’s first discuss what should pop up in to your brain when you think about these terms or why do we need these terms.
Let’s imagine you are doing brand new research meaning it’s not already done. It’s really new research you are doing. You are collecting datum from experiment. How would you know every data you collected is correct. There are two ways to know if the data you collected is correct or not. These two ways are as follows
1) If the data we obtain are quiet close to each other there is chance that we are getting correct data. Here the difference between two data is really small.
Thus if there is small difference between the data we obtain, than this data is said to be precise data.
2) If all the data are close to a fixed value, we can presume we are right.
Here, all the values are close to the average of the data, so, these data are accurate. Thus if average value of data is close to individual data, this is said to be accurate.
Here is the picture obtained from Wikipedia which clearly demonstrates the difference between accuracy and precision.
See the target is closer but still individual shots are far which is more accurate but not precise.
Here target is farther but individual shots are closer which is more precise but not accurate.
Now you know what is the difference between accuracy and precision in chemistry.