Chinese name: ultrapure hydrogen pure hydrogen ultrapure hydrogen
Product purity: 99.9999%
Packing specification: 44L
Filling capacity: 5 cubic meters
Filling pressure: 11mpa
English name: hydrogen
Molecular formula: H2
Molecular weight: 2.0157
Hydrogen is the least dense gas known in the world. It is the substance with the smallest relative molecular mass and the most abundant element in the universe. It is only 1/14th of air, that is, at 0 ℃, the density of hydrogen is 0.0899 g/L. Therefore, hydrogen can be used as the filling gas for airships and hydrogen balloons (due to its flammability and low safety, airships are now mostly filled with helium). Hydrogen is mainly used as a reducing agent.
Hydrogen is colorless and less dense than air (Among all kinds of gases, hydrogen has the smallest density. Under standard conditions, the mass of 1 liter of hydrogen is 0.0899 grams, which is much lighter than air for the same volume). Because hydrogen is hard to dissolve in water, it can be collected by drainage gas collection method. In addition, at a pressure of 101 kPa and a temperature of -252.87 ℃, hydrogen can be transformed into a colorless liquid; at -259.1 ℃, it will become a snow-like solid. At room temperature, the properties of hydrogen are very stable, and it is not easy to chemically react with other substances. But when the conditions change (such as ignition, heating, use of catalysts, etc.), the situation is different. For example, hydrogen has strong activity after being adsorbed by metals such as palladium or platinum (especially adsorbed by palladium). Metal palladium has the strongest adsorption effect on hydrogen. When the volume fraction in the air is 4%-75%, it can cause an explosion when encountering a fire source.
Hydrogen is a colorless and odorless gas with a density of 0.09 g/L (the lightest gas) under standard conditions, and it is difficult to dissolve in water. At -252 ℃, it becomes a colorless liquid, and at -259 ℃ it becomes a snowflake-like solid.
Molecular formula: H2
Boiling point: -252.77 ℃ (20.38 K)
Melting point: -259.2 ℃
Density: 0.0899 kg/m3
Relative molecular mass: 2.0157
Production method: electrolyzed water (2H2O=electricity=2H2↑+O2↑ decomposition reaction), cracking, coal to gas, etc.
Three-phase point: -254.4 ℃
Liquid density (equilibrium state, -252.8 ℃): 70.77 kg/m3
Gas density (101.325 kPa, 0 ℃): 0.0899 kg/m3
Specific volume (101.325 kPa, 21.2 ℃): 5.987 m3/kg
Gas-liquid volume ratio (15 ℃, 100 kPa): 974 L/L
Critical temperature: -234.8 ℃
Critical pressure: 1664.8 kPa
Critical density: 66.8 kg/m3
Heat of fusion (-254.5 ℃) (equilibrium state): 48.84 kJ/kg
Heat of vaporization △Hv (-249.5 ℃): 305 kJ/kg
Calorific value 1.4*10^8 J/kg(2.82*10^5 J/mol)
Specific heat capacity (101.335 kPa, 25 ℃, gas): Cp=7.243 kJ/(kg·K), Cv=5.178 kJ/(kg·K)
Specific heat ratio (101.325 kPa, 25 ℃, gas): Cp/Cv=1.40
Vapor pressure (normal state, 17.703): 10.67 kPa; (normal state, 21.621): 53.33 kPa; (normal state, 24.249 K): 119.99 kPa
Viscosity (gas, normal state, 101.325 kPa, 0 ℃): 0.010 lmPa·S; (liquid, equilibrium state, -252.8 ℃): 0.040 mPa·s
Surface tension (equilibrium state, -252.8 ℃): 3.72 mN/m
Thermal conductivity (gas 101.325 kPa, 0 ℃): 0.1289 w/(m·K); (liquid, -252.8 ℃):’ 1264 W/(m·K)
Refraction coefficient nv (101.325 kPa, 25 ℃): 1.0001265
Combustion limit in air: 5%～75% (volume)
Flammability level: 4
Toxicity level: 0
Explosiveness level: 1
Deuterium is a colorless, odorless, non-toxic and flammable gas at normal temperature and pressure, and is a stable isotope of ordinary hydrogen. It contains 0.0139%～0.0157% in the hydrogen of normal water. Its chemical properties are exactly the same as ordinary hydrogen. But the higher the quality, the lower the response speed.