Hydrogen, helium, ammonia, methane, neon, coal gas and pure nitrogen are all lighter than air. A pocket of air can be made lighter than the surrounding air by heating it. Continue Reading.
Coming in at $500 less than the Forte sedan and hatchback, the Forte Koup is the most affordable car you can get with ventilated seats. Just like the other two Fortes, you have to get the EX model of the two-door and add on the Premium package, which brings the total cost of the car up to $23,315. Share. Tweet.
The fuel level of your tank changes throughout the day, even if you are not driving it. You cannot put fuel into your tank, unless you can get the air out...and you cannot withdraw fuel from your tank unless you can let air in. Up through the 1960's, most vehicles used vented gas caps. This is simply a gas cap with a hole in it.