Hydrogen, helium and oxygen are gases.
Gravity is a physical property of any substance.
Gravity
Hydrogen is dangerous than Helium because Hydrogen is a stronger gas than Helium.
Because hydrogen is reactive and combines with oxygen, while helium is inert.
Helium will not burn. Hydrogen burns in air to form H2O (water) Thus in circumstances where a lite gas is required (e.g. in a balloon) it is safer to use Helium. see http://www.unmuseum.org/hindenburg.htm
helium, hydrogen, nitrous oxide, oxygen
H2O > H2 > He
helium
Hydrogen is dangerous than Helium because Hydrogen is a stronger gas than Helium.
Helium gas, and trace amounts of Oxygen and Nitrogen.
Examples of gas: oxygen, hydrogen, methane, helium, radon, etc.
oxygen,carbon dioxide,helium,hydrogen,ch2
Because hydrogen is reactive and combines with oxygen, while helium is inert.
Helium will not burn. Hydrogen burns in air to form H2O (water) Thus in circumstances where a lite gas is required (e.g. in a balloon) it is safer to use Helium. see http://www.unmuseum.org/hindenburg.htm
Oxygen formed on earth by compound of nuclear fission of sun with helium and hydrogen.
hydrogen,helium,oxygen and fultide dion.
gas
Hydrogen Anaesthetic gas oxygen natural gas helium carbon dioxide argon nitrogen
H2O > H2 > He