However, you can witness some of their properties in different ways:
Hydrogen:
* Burning: When hydrogen gas is ignited, it burns with a pale blue flame, producing water as a byproduct.
* Balloons: Filling a balloon with hydrogen gas will make it float, as hydrogen is lighter than air.
* Stars: Stars are primarily composed of hydrogen, and their fusion process releases tremendous amounts of energy.
Helium:
* Balloons: Helium is also used to fill balloons because it's lighter than air.
* Liquid helium: Helium can be cooled to extremely low temperatures, becoming a liquid with unique properties. You can see its "boiling" when it transitions back to a gas.
* Spectroscope: When light from the sun is passed through a spectroscope, you can observe the distinct spectral lines of helium, indicating its presence in the sun.
Important Note: While you can see the effects of hydrogen and helium, you can't actually see the gases themselves.
Let me know if you'd like to learn more about any of these phenomena!
