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mass per unit volume of a substance. The number of molecules in a particular area or a measure of the compactness of a substance.
a laboratory where the chain reaction is steady and controlled so that only one neutron is...
polyvinyl acetate, a colourless thermoplastic material used in inks and adhesives.
the natural process in which carbon circulates though an ecosystem.
a substance that can accept a proton in an acid-base reaction.
forces of attraction between non-polar molecules (H2; CH4 ) or the atoms of a monatomic gas...