The macroscopic scale is the scale of objects and events that are large enough to be seen by the naked eye (without any optical instruments) .

Macroscopic scale

The microscopic scale is the scale of objects and events that can only be seen using a microscope or other optical instrument because they are so small

Microscopic scale

The quantum scale is the scale of atoms and subatomic particles. 

Quantum scale

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Science concerned with natural phenomena.

Natural Science

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Main Branches of Natural Science

Scales of Size in the Natural Sciences

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