The Role of Helium in Commercial Space

נוב 17 2025

Helium plays multiple critical roles in the space sector, largely due to its unique properties such as chemical inertness, extremely low boiling point, and high diffusivity. To help you quickly grasp its key applications in space, here’s a summary table of core uses:

Application Field	Specific Roles	Key Properties & Explanations
Propulsion System Management	Propellant Tank Pressurization	High-pressure helium is used to smoothly push propellants into engine pumps. It is one of the preferred choices for pressurizing liquid oxygen tanks and also serves as a pressurization medium in high-pressure, low-temperature tests for liquid hydrogen temperature ranges.
	Purging and Displacement	Before launch, helium purges air or impurities from pipelines carrying hazardous propellants like liquid hydrogen, preventing the formation of explosive mixtures. It is also used to operate cryogenic valves in liquid hydrogen systems.
	System Leak Detection	With small molecules and fast diffusion, helium is an excellent tracer gas. Helium mass spectrometers can accurately locate tiny leaks in spacecraft fuel pipelines.
Spacecraft Operation Support	Cold Source Provision	Helium is a key working fluid for achieving ultra-low temperature environments. For example, cryocoolers operating in the liquid hydrogen temperature range (20K, approximately -253℃) often use helium as the refrigeration medium to provide test conditions for space products.
	Precision Instrument Protection	Leveraging its inertness, helium provides a protective atmosphere for precision electronic components or instrument bays on spacecraft, preventing oxidation and enhancing safety.
Special Aircraft	High-Altitude Scientific Balloons	Due to its density much lower than air, helium provides lift for overpressure balloons used by research institutions. These balloons can stay at high altitudes for long periods, carrying scientific equipment for observations and partially replacing satellite functions.

Helium’s Unique Properties and Space Value

Helium’s ability to take on critical roles in space is primarily attributed to the following unique characteristics:

Exceptional Inertness: As a noble gas, helium is extremely unreactive. It ensures safety when in contact with strong oxidizers or flammables like liquid oxygen and liquid hydrogen, eliminating the risk of combustion or explosion.
Extremely Low Boiling Point: Helium has a boiling point of approximately -269℃ (4.2K), making it the most difficult gas to liquefy in nature. This property makes it indispensable in space applications requiring ultra-low temperatures, such as a pressurization gas for rocket propellant tanks and a working fluid in cryocoolers for liquid hydrogen temperature ranges.
Strong Diffusivity: Helium has the second smallest molecules and lowest viscosity among natural gases, with excellent permeability. This makes it an ideal tracer gas for leak detection.

The Role of Helium in Commercial Space

Cutting-Edge Applications and Strategic Significance

Beyond the mature applications mentioned above, helium also shows potential in several cutting-edge space concepts:

Future Propulsion Technologies: A company once experimentally studied microwave propulsion technology, attempting to use microwaves to heat propellants like helium to generate thrust. Such technologies explore helium’s potential as a working fluid in new propulsion schemes.
Strategic Resource and Independent Control: Given helium’s irreplaceable role in space, national defense, scientific research, and other fields, ensuring its stable supply holds significant strategic importance.

Summary

In conclusion, with its unique physical and chemical properties, helium is deeply integrated into all aspects of the space industry. From propellant management during rocket launch, to the stable on-orbit operation of spacecraft, and even to platforms for cutting-edge scientific exploration, helium plays an active and indispensable role.

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