Aluminum.
Because it is light and strong.
polaroid
Balsa wood.
Tungsten
Tungsten is an element. It is used in bulbs
because the cost for the product is greater then the cost for the steel also it is light and when it is in the air it is denser then the clouds
Yes
aluminum
radar
radar
Gravity acts against aeroplanes and forward speed and lift are used to conquer gravity.
Petrol is used in airplanes...a lot of it.