exact value
[exact value|exact value] Measurements are prone to some degree of error, which means we cannot determine the exact value of a measured quantity.
Definition
exact value Measurements are prone to some degree of error, which means we cannot determine the exact value of a measured quantity. This uncertainty prevents us from calculating propagated error precisely.
Mechanism
exact value To estimate the relative error, consider ay Since we do not know the exact value of the volume V, use the measured radius r = 4000 mi to estimate V. We obtain V ~ (4}-(4000)°. | Since all measurements are prone to some degree of error, we do not know the exact value of a measured quantity, so we cannot calculate the propagated error exactly.
Examples
exact value Later in the text, cases such as this use analytical tools to approximate x-intercepts to a very high degree.