Translation guide
The metal aluminum. In Japanese, it is almost always referred to as アルミ (arumi), a loanword from English. The full form アルミニウム is also used, especially in formal or scientific contexts.
Referring to the lightweight, silvery metal used in cans, foil, construction, etc.
Buy some aluminum foil.
The full form, used in formal, scientific, or technical contexts. Less common in daily conversation.
Aluminum is lightweight and corrosion-resistant.