What are the two primary materials that scuba tanks are made from?

Scuba tanks are primarily constructed from aluminum and steel due to their strength and ability to withstand high pressure. Aluminum tanks are lightweight, corrosion-resistant, and have a good strength-to-weight ratio, making them a popular choice among recreational divers. They are easier to handle and transport. Steel tanks, on the other hand, are heavier and typically have a higher capacity for air, which can allow for longer dive times before needing to be refilled.

Both materials are designed to meet stringent safety standards to ensure they can safely contain compressed air at substantial pressures. The choice between aluminum and steel often depends on personal preference and specific diving needs, such as the type of diving and the desired buoyancy characteristics. Other materials like plastic and iron do not meet the required specifications for pressure containment or durability for scuba diving applications.