Examlex
The average density of a comet is approximately one-quarter times the density of water.
Basic Concepts
Concepts that have a moderate number of instances and that are easier to acquire than those having few or many instances.
Moderate Number
A quantity that is considered neither small nor large, typically seen as reasonable or average.
Instances
Specific examples or occurrences of a particular event or situation.
Acquire
To gain possession or control of something, often through effort or skill.
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