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The standard unit of time interval is the second(s). However, many engineering applications require the measurement of shorter time. intervals, such as milliseconds (1 ms = 10 3 s), microseconds (1 μ - 6 - 9 s = 10 s), nanoseconds (1 ns = 10 s), and picoseconds (1 ps = 10 12 s).
The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. The SI is the dominant measurement system used in science and international commerce. In recognition of this fact, Congress has designated the metric system of measurement as the
The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. Long the dominant measurement system used in science, the SI is becoming the dominant measurement system used in international commerce.
It is created by measuring a small time unit (like the second) and then counting the number of elapsed seconds to establish longer time intervals, like minutes, hours, and days.
1. SI Units. Length, mass, and time play a fundamental role in describing nature. These are the three quantities on which we base our measurements. Length, mass, and time are called dimensions. We use the International System of Units (also called the metric system or the SI system, for the French term Système International).
A scalar is a physical quantity which can be specified by just giving the mag-nitude only, in appropriate units. Examples of scalars are mass, time, length, speed. Scalar quantities may be added by the normal rules of mathematics. A very important class of physical quantity is Vectors.
A unit is a particular physical quantity, defined and adopted by convention, with which other particular quantities of the same kind are compared to express their value. A measurement is a direct or indirect comparison of a certain quantity with an appropriate standard or unit of measurement.
