00:01
Hi there.
00:03
Percent error is a way of calculating how close an experimental value is to the accepted or the theoretical value.
00:13
So to calculate percent error, it is typically an absolute value.
00:19
Occasionally, some sources do want the negative or positive signs in there, but typically it is an absolute value, and it's the absolute value of the difference between the experimental value.
00:33
So what is measured in the lab minus the accepted or the theoretical value.
00:46
So what it should be.
00:48
So you find the difference between the experimental value and what it should be.
00:53
Again, there are absolute value signs around that.
00:56
So you would take the absolute value of that difference.
00:59
And then you divide that difference by the theoretical value.
01:06
And you want to express this as a percent.
01:09
So you would then multiply by 100.
01:12
Adding your percent sign.
01:15
So let's look at these four percent errors here.
01:19
In the first one, the experimental value is 8 .86.
01:25
And in the interest of time, i am going to leave off the units here.
01:29
You would certainly want to put those in for your values.
01:34
So i'm going to find the difference and divide by what it should have been.
01:40
So that 8 .96 is the theoretical.
01:44
That's what it should be.
01:46
And then multiply by 100%...