'Base si units' diaporamas de présentation

Overview of Time and Frequency Metrology

Overview of Time and Frequency Metrology. Michael Lombardi lombardi@nist.gov. NIST Boulder Laboratories. Date and Time-of-Day records when an event happened Time Interval duration between two events Frequency rate of a repetitive event. Types of Time and Frequency Information.

856 views • 83 slides

Units and Measurement

312 views • 28 slides

Introduction and Mathematical Concepts

Introduction and Mathematical Concepts. Chapter 1. 1.1 The Nature of Physics. Physics has developed out of the efforts of men and women to explain our physical environment. Physics encompasses a remarkable variety of phenomena: planetary orbits radio and TV waves magnetism lasers

206 views • 20 slides

Chapter 1.4

Chapter 1.4. Units of Measurement. Metric System. Units for scientific measurements Developed in France in 18 th century Unlike English system. SI Units. 1960 international agreement Preferred metric units 7 base units. Prefixes. Decimal fractions Multiples of various units

168 views • 16 slides