Of the population, 15.7% live in a semi-arid/ steppe climate (BS), 9.1% live in a arid/ desert climate (BW), 6.2% live in a temperate/ mesothermal climate with significant precipitation in all seasons (Cf), 53.2% live in a temperate/ mesothermal climate with dry summers (Cs), 0% live in a polar climate (E), 15.8% live in a alpine/ highland climate ( ...
Gasoline is also an extremely flammable fuel, and one that does not escape like hydrogen.. The hydrogen fuel cell tanks in the Toyota Mirai are pressurized up to 10,000 psi, and hydrogen is 16 times lighter than air.
| show 2 more comments. up vote 5 down vote. Yes, hydrogen is lighter than helium but helium, on the other hand, is an inert gas (very less reactive). Also, hydrogen is highly flammable so that would make it unsafe to play with balloons.