Measurements and Experimentation - Systems of Unit

Vocabulary flashcards covering the definitions and fundamental concepts of physical measurements and units based on the lecture notes.

Measurement

The process of comparison of the given physical quantity with the known standard quantity of the same nature.

Unit

The quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature.

Magnitude of a Physical Quantity

The total value expressed by the product of parameters: $\text{Physical quantity} = (\text{numerical value}) \times (\text{unit})$.

Choice of Unit

The selection criteria for a universal unit, requiring it to be of convenient size, defined without ambiguity, reproducible, and unchanging with space and time.