the molecues are lighter than the ones in the air.
because earth has gas particles that can let helium go
Helium is lighter than oxygen and can escape the ozone.
Gases like helium can escape Earth's atmosphere because they have low molecular weight, which allows them to reach escape velocity more easily. Additionally, helium is light enough to be carried away by solar winds, contributing to its escape from the atmosphere.
helium is the lightest air
If the lid is removed from a container holding helium gas, the helium will escape into the surrounding environment since helium is lighter than air. This can result in the helium dispersing quickly due to its low density compared to the air around it.
An atmosphere composed mainly of hydrogen and helium would likely be very thin and lightweight compared to Earth's atmosphere. These gases are light and tend to escape easily into space due to the planet's gravity. Such an atmosphere might be similar to that of gas giants like Jupiter and Saturn.
Water escape in the atmosphere as a gas.
helium
hydrogen and helium
Helium does not exist in atmosphere as it is a very light gas.
helium is a gas and is found only in the earth's atmosphere
The moon's escape velocity is lower than the average velocity of gas particles in its atmosphere, so the moon cannot retain an atmosphere as the gas particles would escape into space. This is why the moon has no significant atmosphere.