6. Glossary

Cryogenic

Relating to very low temperatures (below approximately −150 °C), as well as the technologies, materials, or phenomena associated with them.

Cryotechnics; cryotechnic

All techniques used to manipulate extreme cold.

Dihydrogen; dihydrogen

Molecular form of the element hydrogen that exists in a gaseous state and under conditions of use as an aviation fuel. Dihydrogen can be cooled below its condensation point, which is 20.28 kelvins (−252.87 °C) at atmospheric pressure of 101,325 Pa. It is then called liquid hydrogen (LH2).

Turboprop engine; turboprop

Propulsion system powered by a combustion turbine, with main thrust provided by the rotation of a multi-blade propeller.

Airframe...