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The official base SI unit of time is the second (s). Since SI units are used as the standards of all respectable science, this is the unit of time most used by true scientists. Although other units of time are used, this is the most commonly used among all scientific fields. Particular fields might use other units more often depending on the particular content that scientists in that field concentrate on.
The metric unit most often used to describe weight is the Kilogram.
All scientists use the metric unit of measurements because it is the most accurate.
Kilogram.
Speed of light
The official base SI unit of time is the second (s). Since SI units are used as the standards of all respectable science, this is the unit of time most used by true scientists. Although other units of time are used, this is the most commonly used among all scientific fields. Particular fields might use other units more often depending on the particular content that scientists in that field concentrate on.
most scientists and engineers use the metric system to collect data and preform experiments.
The metric unit most often used to describe weight is the Kilogram.
Most scientist use the metric system
Not often because it is a tool to imagine astronomical distances, not a form of accurate measurement designed for equations and planning of a flight path. It is also too large for most missions.
Joules
grains
All scientists use the metric unit of measurements because it is the most accurate.
Non-commissioned officers.
Kelvin.
Grains
"liter"