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Pure hydrogen is a colorless, odorless, and tasteless gas that is the lightest element in the universe. It is the most abundant element in the universe, making up about 75% of all normal matter.

Pure hydrogen is used in a variety of applications, including:

• Fuel: Pure hydrogen can be used as a fuel in fuel cells and internal combustion engines.
• Chemical production: Pure hydrogen is used to produce a variety of chemicals, such as ammonia and methanol.
• Metalworking: Pure hydrogen is used to create a protective atmosphere in metalworking processes, such as brazing and soldering.
• Food processing: Pure hydrogen is used to remove oxygen from food, which can help to extend shelf life and improve taste.
• Medical: Pure hydrogen is used in medical applications, such as MRI machines and lasers.

Pure hydrogen is a safe and effective gas, but it is important to use it in the correct way. Pure hydrogen can be dangerous if it is not used properly. For example, breathing pure hydrogen can cause asphyxiation.

It is important to follow all safety precautions when using pure hydrogen. For example, it is important to always wear personal protective equipment (PPE) such as safety glasses, gloves, and a respirator when handling pure hydrogen. It is also important to store pure hydrogen in a cool, dry place.

If you are ever unsure about how to use pure hydrogen, you should consult with a qualified professional.

Here are some of the properties of pure hydrogen:

• Color: Colorless
• Odor: Odorless
• Taste: Tasteless
• Density: 0.0899 g/L
• Melting point: -252.87 °C
• Boiling point: -252.87 °C
• Critical temperature: 33.2 °C
• Critical pressure: 22.06 atm
• Specific heat capacity: 14.30 J/g·K
• Molar mass: 2.01588 g/mol