Chemistry
Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as

Additives
Synergism
Independent
Antagonism

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Chemistry
Table salt gets moist during rainy season because

Sodium chloride is hygroscopic
Sodium chloride contains some quantity of sodium iodide
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride is deliquescent

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