2025年1月26日 · The two forms of hydrogen have slightly different physical properties. The melting point of para -hydrogen is 0.10° lower than that of a 3:1 mixture of ortho -hydrogen and para -hydrogen.

2020年7月7日 · Chemical properties of hydrogen: The chemical properties of hydrogen depend mainly on its bond dissociation energy. Due to high bond dissociation energy (436 kJ/mol), high energy is required to break the H-H bond. This makes hydrogen quite stable and unreactive at ordinary temperature.

Stars, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found in water, organic compounds, as the gas H 2 (dihydrogen), and in other molecular forms. The most common isotope of hydrogen (protium, 1 …

Hydrogen, H2, is a colorless, odorless gas. Hydrogen is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The vapors are lighter than air. It is flammable over a wide range of vapor/air concentrations. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air.

This page titled 2.2: The Physical Properties of Hydrogen is shared under a CC BY 3.0 license and was authored, remixed, and/or curated by Andrew R. Barron via source content that was edited to the style and standards of the LibreTexts platform.

Hydrogen, bearing the atomic number 1, is the simplest, lightest, and most abundant chemical element in the universe. Its ubiquity and versatile properties make it vital for a wide range of applications—from serving as a crucial component in water to acting as a …

The three isotopes of hydrogen gas molecules are represented as H 2 (dihydrogen), D 2 (di-deuterium), and T 2 (di-tritium). The chemical properties of all these gas molecules are basically the same but hydrogen isotopes differ in their physical properties.