The door frames and airplanes are made of solid Al. The lab stuff is in powder form and dust explosions are especially dangerous. You can read more about it here.
http://en.wikipedia.org/wiki/Dust_explosion
Aluminum metal is used in many familiar objects, from frying pans to screen doorframes and jet aircraft. However, the bottle of aluminum powder in the chemis try laboratory carries a warning that the contents are potentially dangerously combustible.
Explain these observations.
1 answer