* Chemical Composition: Water is a compound, meaning it's formed by the chemical combination of two or more elements. It consists of two hydrogen atoms bonded to one oxygen atom. Hydrogen, on the other hand, is an element, consisting of only one type of atom.
* Physical State: At room temperature and pressure, hydrogen exists as a colorless, odorless gas. Water exists as a liquid.
* Reactivity: Hydrogen is highly flammable and reactive, readily combining with other elements. Water is relatively unreactive and stable.
* Density: Hydrogen is the lightest element and has a very low density. Water is much denser than hydrogen.
* Boiling Point: Hydrogen has a very low boiling point (-252.87 °C), while water has a much higher boiling point (100 °C).
In summary, water and hydrogen are fundamentally different substances with distinct properties due to their different chemical compositions and structures.
