Calibration error and measurement error. Also, if the measurements are of different objects there may be random error.
( 1 ) Measurement should be accurate. ( 2 ) Measurement must have the correct units specified.
No. Accuracy is the closeness to an external standard to which a measurement is made. Precision, on the other hand, is the resolution of the measurement. While it may appear the two factors are related, because you can be precise without being accurate, while the converse is not necessarily true, they are, formally, two different aspects of a measurement.
Neither measurement is more "accurate" than the other--they simply denote different things. Length is a measurement of the distance between two points in space. Area is a measurement of the surface covered by a given shape.
Temperature and pressure.
When measuring, there are two types of deviation, accuracy and precision. A measurement is close to the accepted value when it his highly accurate.
When measuring, there are two types of deviation, accuracy and precision. A measurement is close to the accepted value when it his highly accurate.
Never: A measurement made is always an approximation. We can get very close to being accurate with our measurements, but never fully 100% accurate. This is not the fault of the person measuring, or what tool they are using to measure with, but it is a natural law that we (anyone, even superior aliens to humans) cannot ever fully make an absolutely accurate measurement.
The are two different systems of measurement customary and metric, but ml is more accurate because of smaller increments
Accurate record keeping.
MASS of both objects, and the DISTANCE between them.
age, gender, avtivity level and weight.