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Lighter than air
Lighter than air
refers to materials (usually
gases
) that are
buoyant
in
air
because they have
average densities
lower than
that of air
. Dry air has a density of about 1.29
g/L
(gram per liter) at
standard conditions for temperature and pressure
(STP), and an average molecular mass of 28.97
g/mol
.
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