Answer Happy

Saved Question 3 5 points Although hydrogen gas has about half the density of holum gas, and therefore it can be used to in heavier loads than a holum-lied balloon of the same volums, we often don't use it when lifting humans due to select all that apply) a hydrogen gas is very flamablo b. holum gan is cheap, plentiful, and easy to obtain on Earth c hydrogen gas is far too hard to contain inside a balloon d. hydrogen gas is very rare and hard to come by De hydrogen gas has a very nasty smell