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Sigma KEE - Raining

KB Term:

降雨

Raining 是一种 Precipitation Process，当中 Water 以 Liquid 状态下坠，雨点的 approximateDiameter 介乎 0.1-9 Millmeter。

Relationships
Parents	沉淀	Precipitation is the process of water molecules falling from the air to the ground, in either a liquid or frozen state.
Children	酸雨	AcidRainfall is the subclass of Raining in which the precipitate contains harmful amounts of SulphurDioxide, NitricOxide or NitrogenDioxide. The standard for acid rain is below 5pH.
	毛毛雨	Drizzling is a subclass of Raining when the raindrops are less than or equal 0.5 Millimeter in approximateDiameter.
	大降雨	HeavyRaining is rainfallIntensity between 10-50 Millimeter per HourDuration.
	骤雨	A RainShowering is a short period of Raining.