Textbook Guide Physics: Carbon-12, The International (Golf), Significant Figures
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PHY131H1 Full Course Notes
Verified Note
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Document Summary
The purpose of physics is to establish units for measurements and comparisons when designing and conducting experiments. Quantities in physics include: length, time, mass, temperature, pressure, and electric current. Physical quantity is measured in its own units by comparison with a standard. Unit: a name assigned to the measures of that quantity. The standard corresponds to exactly 1. 0 unity of the quantity. Example: standard for length, is exactly 1. 0 m, is the distance traveled by light in a vacuum during a certain fraction of a second. Physical quantities are organized by their assigned standards. All physical quantities are defined by their base quantities and their base standards. Base standards must be both accessible and invariable. In 1971, seven quantities were selected to be base quantities forming the basis of the international system of units (si). Scientific notation is used to express large and small quantities. Prefixes are used when dealing with measurements.
