It would work, but not very well. Anyone with patience and a hacksaw could cut right through it while locked, and aluminum bends too easily.
Door keys are made from nickel plated brass. Some luggage and briefcase lock keys are made from aluminum.
An aluminum nail that is less dense than the element aluminum would not be made of pure aluminum, but would have to be an alloy of aluminum and some other substance. If an aluminum nail is made of pure aluminum, it would have the same density as the "actual" element.
Most are made with aluminum most certainly fly.
Aluminum
because the fridge is made of a magnetic metal, some new fridges are now made of aluminum
Probably aluminum and plastic.
No - pure aluminum is much too soft and weak for any industrial purpose. It would be made of a carefully crafted aluminum alloy, which would contain aluminum and several other metals.
Car door handles are typically made with a combination of metal alloys for durability. Common metals used include steel, aluminum, or a combination of both. Some high-end cars may use other materials such as chrome-plated brass or even carbon fiber for a more luxurious look.
aluminum is not made from another metal, it is not an alloy. aluminum is a pure metal, made purely of itself.
No but it is made of aluminum which is the most prevalent element in the earth.
The reason is that aluminum is a cheap metal. There are in fact other door knobs that are made out of steel, but these cost a lot more and are more heavy to turn around, which makes them unpopular to produce.