@airdrop_this_to_someone on Instagram: "The operating principle of a liquid hydrogen rocket engine can be divided into several key stages: 1. Storage and supply of fuel and oxidizer: A liquid hydrogen rocket engine uses liquid hydrogen (LH2) as fuel and liquid oxygen (LOX) as an oxidizer. These substances are stored in two separate cryogenic tanks at very low temperatures (hydrogen about -253°C, oxygen about -183°C). Fuel and oxidizer are supplied to the fuel lines using high-pressure pumps. 2.