Metrology is the science of measurement, and it deals with the development of standards, methods, and instruments for measuring physical quantities.

Calibration is the process of comparing a measurement device or instrument to a known standard to ensure that it is accurate and reliable.

Inspection is the process of examining a product or service to determine whether it meets specified requirements.

Verification is the process of confirming that a product or service meets specified requirements.

Testing is the process of evaluating a product or service to determine its performance, reliability, and durability.

SI stands for Systeme International d'Unites, and it is the international system of units.

The base unit of length in the SI system is the meter.

The base unit of mass in the SI system is the kilogram.

The base unit of time in the SI system is the second.

The base unit of temperature in the SI system is the Kelvin.

Calibration is the process of determining the accuracy of a measurement device or instrument.

Testing is the process of determining the precision of a measurement device or instrument.

Testing is the process of determining the repeatability of a measurement device or instrument.

Testing is the process of determining the reproducibility of a measurement device or instrument.

Testing is the process of determining the uncertainty of a measurement.