Additive

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Additive

Any material or substance added to something else. Specifically, a substance added to a propellant

to achieve some purpose, such

as a more even rate of combustion, or a substance added to fuels or lubricants to improve them or give them some desired quality, such as tetraethyl lead added to a fuel as an antidetonation agent, or graphite, talc, or other substances added to certain oils and greases to improve lubrication qualities.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use