Area - m2, Distance - light year, Density (measure) - kg/m3, Volume - m3, Mass (measure) - kg, Area (shape) - plane figure, Length (object) - rope, Density (object) - measuring jar, Volume (definition) - amount of a substance, Mass - g/cm3, Displacement - metre, Light through vacuum - uniform velocity, Speed of a ship - knot, Gravity centre of geometric objects - geometric centre, Stability - larger base area, Valency - electrons in the outmost orbit, Neutral particle - neutron, Iron - Fe, Hydrogen - monovalent, Positively charged particle - proton,

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