
Concept explainers
Interpretation:
The reason for the SI standard for time to be based on the distance light travels through a vacuum needs to be explained.
Concept introduction:
The International System of Units or SI units is the modern form of metric system. The second (s) is the SI unit of time, metre (m) is the SI unit of length, kilogram (kg) is the SI unit of mass), ampere (A) is the SI unit of

Explanation of Solution
Theoretically, there are no particles present in vacuum. Therefore, the light does not interact with the particles. If the light interact or bounce with the matter, speed of the light will be different from the initial speed. Hence, the
Thus, in order to get the accurate measurement the speed of light is measured in vacuum.
Chapter 2 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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