General Physics 1
Science, Technology, Engineering, and Mathematics
Lesson 1.1
Units of
Measurement
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General Physics 1 Science, Technology, Engineering, and Mathematics Lesson 1.
Units of
Measurement
On July 23, 1983, Air Canada Flight 143 ran out of fuel midway through its flight due to company failures, human error, and confusion with units.
Measurements are observed daily from speed limits on highways to mass of grocery items.
Measurements and units are
essential not only in science but
also in other several fields.
These extensive usage of
measurement requires a
reference standard.
Learning Competency At the end of the lesson, you should be able to do the following:
● Solve measurement problems involving
conversion of units (STEM_GP12EU-Ia-1).
Learning Objectives At the end of the lesson, you should be able to do the following:
● Explain the importance of a standard system
of measurement.
● Discuss the SI units.
● Solve problems involving conversion of units.
Measurement ● (^) It is a process of assigning a quantity to describe a property of an object by comparing it with a standard. ● (^) A standard should be universal and does not change with time.
International System or SI ● (^) It is the standard system of measurement for the fundamental quantities abbreviated from Système International. ● (^) It is established in 1960. ● (^) It is also called as the “metric system”.
SI base units with their corresponding symbols Quantity Typical symbol Unit Symbol thermodynamic temperature T kelvin K amount of substance n mole mol luminous intensity Iv candela cd SI Base Units
Remember
● Typical symbols of quantities are
usually written in italics and may
vary in different references.
● Symbols for the units are always
written in an upright (roman)
font and are mandatory.
Today, base units are defined using the defining constants.
What are the seven SI base
units?
Kilogram ● (^) Shown on the right is a replica of the International Prototype Kilogram (IPK) used since the 19th century. ● (^) Kilogram was redefined in May 2019. SI Base Units
SI Base Units Kilogram (kg) redefined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 ✕ 10 − when expressed in the unit J s, which is equal to kg m 2 s − .