This painless condition occurs when the little bumps on your tongue grow long and trap bacteria that live in your mouth -- making the tongue look black and hairy. Causes can include antibiotic use, poor oral hygiene, smoking, drinking a lot of tea or coffee, and not producing enough saliva.
Hello, Jie. The word passivate is a bit troublesome because aluminum cannot be passivated in the same sense as stainless steel; but it can be passivated in the same sense as zinc plating, i.e., with a chromate conversion coating.
Best Answer: Because the properties of aluminium cause it to reflect and deflect heat rather than absorbing it. If it doesn't absorb the heat then it won't overheat and catch on fire.Source(s): â«Damageâ« Â· 8 years ago.est Answer: Because the properties of aluminium cause it to reflect and deflect heat rather than absorbing it. If it doesn't absorb the heat then it won't overheat and catch on fire. Source(s): â«Damageâ« Â· 8 years ago.