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Sigma KEE - FreshWater

淡水

FreshWater is the subclass of Water that has low soluble mineral content. See also DrinkingWater.

Relationships
Parents	Water	The Class of samples of the compound H20. Note that this Class covers both pure and impure Water.
Children	飲用水	DrinkingWater is the subclass of Water that is safe to be consumed by Human.
	TapWater	TapWater is Water from the tap. It is mostly safe to be consumed by Human in some advanced countries, but it may also contain harmful substance, such as lead which are bad for human health. It is this reason that it is not classfified under DrinkingWater.