Helium vs Hydrogen
Helium and Hydrogen are genuine alternatives to one another — a choice somebody actually makes — and differ on 4 measured properties, density most clearly.
Helium vs Hydrogen
Helium
He
An inert gas that cannot be manufactured, is escaping the planet continuously, and is being spent on party balloons.
Hydrogen
H
The lightest and most abundant element in the universe, and the one most often proposed as a replacement for the fuels we currently burn.
| Property | Helium | Hydrogen |
|---|---|---|
| Atomic number | 2 higher | 1 |
| Density | 0.0001785 g/cm³ higher | 0.00008987 g/cm³ |
| Melting point | -272.2 to -272.05 °C | -259.14 °C higher |
| Molar mass | 4.002602 g/mol higher | 1.008 g/mol |