A compound containing only the elements hydrogen and carbon. It may also exist as a solid, a liquid or a gas. The term is mainly used in a catch-all sense for oil, gas and condensate.

A forming process in which a tube is placed into a forming die. The tube is then formed to the shape of the die through the application of internal water pressure. The hydroforming process allows for severe shape deformation, making it ideal for automotive structural parts such as engine cradles, radiator supports, and body rails. Various shaped and sized holes can be punched in the tube almost anywhere during the process.

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all baryonic mass.  The 3 most common types of hydrogen are: 

1. Grey Hydrogen: The most common form of hydrogen, it's created from fossil fuels and the process releases carbon dioxide which is not captured.
2. Blue Hydrogen: Blue hydrogen uses the same process as grey, except this time the carbon is captured and stored.
3. Green Hydrogen: Green hydrogen is made by using a process called electrolysis to split water into hydrogen and oxygen. If that process is powered by a renewable energy source, such as wind or solar power, then the hydrogen is referred to as being green.
    

Hydrogen can be stored physically as either a gas or a liquid. Storage of hydrogen as a gas typically requires high-pressure tanks. Storage of hydrogen as a liquid requires cryogenic temperatures. Hydrogen can also be stored on the surfaces of solids, by adsorption, or within solids, by absorption.

Hydrometallurgy involves the use of aqueous solutions for the recovery of metals from ores, concentrates, and recycled or residual materials. Processing techniques that complement hydrometallurgy are pyrometallurgy, vapour metallurgy, and molten salt electrometallurgy. Hydrometallurgy is typically divided into three general areas:

• Leaching
• Solution concentration and purification
• Metal or metal compound recovery