List includes 42 beautiful flowers for garden cultivation. Plants can be grown as annuals, perennials, or bulbs. Some plants are toxic to humans and animals
Hydrogen has highest flammability rating of 4 on NFPA 704 scale. Can ignite with air at 4% volume ratio. Has widest explosive/ignition mix range among gases. Can cause explosions even with proper ventilation
Gas giants are planets composed mainly of hydrogen and helium. Jupiter and Saturn are the main gas giants in the Solar System. Uranus and Neptune are now classified as ice giants. Gas giants contain 3-13% heavier elements in their mass
Hydrogen is the lightest element, making up 75% of universe's matter. Colorless, odorless, non-toxic gas with formula H2. Forms strong H-H bonds and is highly combustible. Exists in two spin isomers: orthohydrogen (75%) and parahydrogen (25%)
Exosphere is thin atmosphere-like volume surrounding planets with gravitationally bound molecules. Located directly above thermosphere, extending to outer space. Boundary between exosphere and space can be difficult to define
Hydrogen is mainly used in refining and chemical sectors, producing significant CO2 emissions. Global hydrogen use reached 95 Mt in 2022, growing 3% year-on-year. Low-emission hydrogen production remains below 1% of total production