Error Analysis
Q1: Define error.
Answer: The exact measurement of a physical quaintly is not possible. This is known as Heisenberg's uncertainly principle. Uncertainty in the measurements is called error.
Numerically, the deviation of the measured value from the actual value is called an error. If X is the quantity measured, then ΔX is called error in X. i.e. Error = Actual value - Measured value.