Measurement uncertainty

When something is measured, it means that a certain amount or unit has been used to measure it. Measurement uncertainty means that while we measure something, we don't know exactly how much it is. We can use something called a measuring device to measure the amount, but even the device can have some uncertainties, because it can read the measurements differently each time. So to be accurate, we need to account for the uncertainty in the measurements. This means that when we measure something, we have to give it a range of numbers that it could be, rather than a single number. For example, if something is measured as between five and seven centimeters, then you know that it is somewhere between five and seven centimeters.