- Physical Sciences
mass per unit volume of a substance. The number of molecules in a particular area or a measure of the compactness of a substance.
polyvinyl acetate, a colourless thermoplastic material used in inks and adhesives.
the use of an electric current to cause chemical change in a liquid.
the process whereby carbon is turned into carbohydrates in plants, and becomes available as an...
a proton that forms a coÂordinate covalent bond with a water molecule H3O+