There is the weather balloon, and the zeppelin.
Both use Helium, and no longer Hydrogen due to hydrogen's tendency to quickly catch fire.
in a balloon and in a hydrogen car
A hydrogen balloon rises in air because the hydrogen gas inside the balloon is lighter than the surrounding air. This makes it buoyant, causing it to float upwards. The difference in density between the hydrogen gas and the air creates an upward force, lifting the balloon off the ground.
A hot air balloon doesn't contain helium or hydrogen.
A balloon with CO2 instead of helium or hydrogen
No. Steam is simply water in a gaseous state. The hydrogen and oxygen remain chemically bonded to one another.
I captured hydrogen through a tube in a balloon. Then, with the balloon not all the way blown up, I put some oxygen in it. When I lit the balloon with a lighted punk it exploded with more heat and force than just a balloon with hydrogen. when the two gases were in the same balloon and not exploded they were added but not combined. When they exploded they became combined. Please, do not do this unless you have an experienced lab tech helping you.
The hydrogen in a sealed rubber party balloon is compressed slightly by the balloon rubber. So its density decreases a little, its pressure increases, and its temperature increases. But the temperature soon returns to the ambient temperature as heat is lost through the balloon wall. Also, the hydrogen will not stay in the balloon for long because it will leak out through pores in the rubber.
No, a blimp is not a type of hot air balloon. While both are inflated with gas to become buoyant, hot air balloons rely on heated air to rise, while blimps are powered by engines and filled with helium or hydrogen gas for lift.
Hydrogen is lighter than helium. So hydrogen balloon will float better than helium.
A hydrogen balloon will deflate the fastest because molecules of hydrogen are the smallest and thus will more easily slip through the latex of the balloon. The carbon dioxide-filled balloon will deflate the slowest because these molecules are the biggest, and thus will have more trouble escaping the tiny pores in the balloon.
If the balloon were lofted by hydrogen, it would not be a "hot air" balloon, as no heat would be needed. Indeed, to get even a spark near the hydrogen would be for the balloon to go up in a huge fireball. Hydrogen was abandoned as a lift gas for lighter -than-air craft in the 1930's, exactly for that reason.
Hydrogen is less dense than air, so it creates a buoyant force that causes the balloon to rise. This is because the density of the hydrogen inside the balloon is lower than the surrounding air, making it lighter and causing it to float upwards.