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• February 16, 2022

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• PHY101 Physics I © Dr.Cem Özdoğan

• Measurement
• Defined by relationships to base quantities
• Each defined by a standard, and given a unit

• SI Units
• International System of Units
• Each base unit has an accessible standard of measurement

• Length
• Meter is defined by the distance traveled by light in a vacuum in a specified time interval

• Changing Units
• Use chain-link conversions
• Write conversion factors as unity
• Manipulate units as algebraic quantities

• 1 Summary

• Time
• Second is defined in terms of oscillations of light emitted by a cesium-133 source
• Atomic clocks are used as the time standard

• Mass
• Kilogram is defined in terms of a platinum-iridium standard mass
• Atomic-scale masses are measured in u, defined as mass of a carbon-12 atom

• Density
• Mass/volume

• Eq. (1-8)