00:01
All right, so are numbers exact or not? and one of the main ways you can tell is if you measure it on a device, that's not exact.
00:11
If you can use your eyes to count it, it's going to be exact.
00:18
So, for instance, if you wanted to deal with a 32 ounce can of coffee, well, how did they measure that? they put that on a balance.
00:28
Was it 32 ounces? was it 31 .99? was a 32 .01.
00:33
It's not an exact number.
00:35
Okay? so anytime you're going to use a balance or a scale, you're not going to get a truly exact number.
00:44
You can always have another decimal place that you don't know.
00:48
However, the number of students in chemistry class, you can use your eyes.
00:53
You can count that to a whole number.
00:55
There isn't a such thing as 0 .2 students.
00:58
All right.
00:59
So you can get an exact value for.
01:02
That...