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Brackish water (less commonly brack water) is water that has more salinity than fresh water, but not as much as seawater. It may result from mixing of seawater with fresh water, as in estuaries, or it may occur in brackish fossil aquifers.
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Chlorinated hydrocarbons consist of simple hydrocarbons in which one or more hydrogen atoms have been replaced with chlorine.
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A small spherical particle of any liquid; in meteorology, particularly a water droplet.
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A heavy nucleus can contain hundreds of nucleons which means that with some approximation it can be treated as a classical system, rather than a quantum-mechanical one.