Ahelium-filled blimp stays aloft since helium is less dense than regular air, so helium will rise above regular air. the density of helium is about 1.1kg/m^3 less than regular air, which means a cubic meter of helium can lift about 1.1kg. a blimp with a mass of 2.13 x 10^5kg can carry as much as 2 x 10^5m^3 of helium. if the average mass of a person with luggage is 10^2kg what is the number of passengers the blimp can carry

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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