hot air
The opposite of lightest is heaviest.
The superlative for "light" is "lightest."
The least dense element is hydrogen hence it would be the lightest thing with mass. However there are 'massless' particles, such as photons.
Hydrogen gas has the lightest density of any liquid.
Photons (quanta of light) are believed to have zero rest mass, and so would qualify as the lightest objects.The current experimental upper bound for the mass of a photon is 10-18 eV/c2, or (in S.I. units) about 10-54 kg.
helium is the lightest air
They are mostly air.
The lightest gas in the universe is probably hydrogen having atomic mass 1 u.(approx).
The opposite of lightest is heaviest.
3.0 Lbs
That depends on the definition you have for laptop. Sometimes yes, and sometimes no.
the lightest elements are gases and the lightest of these are hydrogen and helium.
Hydrogen gas is the lightest. With a formula of H2, it has an atomic mass of only half that of helium. It is highly reactive and there isn't much of it just floating around by itself. Plus, because it is so light, it just floats right up out of our atmosphere and into space.
Air and bubble wrap are some of the lightest materials commonly used for packaging. They provide cushioning and protection for fragile items while adding minimal weight to the overall package.
The lightest gaseous element is hydrogen, with a density around 7% that of air; The heaviest is radon, with a density of around 8.5 times that of air.Radon is radioactive, and relatively short lived; the heaviest stable element is xenon, with a density around 4.5 times that of air.
I believe that would be the appendix.
The lightest metal is lithium.