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The opposite of lightest is heaviest.
the lightest elements are gases and the lightest of these are hydrogen and helium.
The first fraction to separate out of petroleum during fractional distillation is usually the lightest fraction, which includes gases like methane, ethane, and propane. These fractions have lower boiling points and are typically collected at the top of the fractionating column.
The lightest metal is lithium.
The superlative form of the adjective 'light' is lightest.
Hydrogen is the lightest element. The isotope protium is the lightest kind of hydrogen atom.
ANSWER:The ant is the lightest animal in the world.
Iron 56 is the lightest
No hydrogen is the lightest element.
gas is the lightest in weight
The superlative for "light" is "lightest."
Hydrogen was, and is, the lightest gas