Hydrogen is the lightest and most abundant element in the universe. It is the chemical element with the symbol H and atomic number 1. Hydrogen is a colorless, odorless, and highly flammable gas at room temperature. It is the primary building block of the universe and is found in the stars, including our Sun, as well as in vast quantities in gas giant planets like Jupiter.
Hydrogen-oxygen mixtures, known as heliox, can be used in respiratory therapy to improve breathing in patients with certain respiratory conditions. Heliox is often used in cases of airway obstruction or in patients who have difficulty exhaling due to conditions like asthma or chronic obstructive pulmonary disease (COPD).u
