Toda matéria do Universo é formada por pequenas partículas chamadas de átomos. Há 92 tipos de átomos diferentes na natureza, os quais podem se unir e formar os diferentes tipos de materiais que você conhece. Assinale a alternativa que contém um material (ou substância) formado por agrupamentos de átomos diferentes. (a)Gás Hidrogênio.
(b)Mercúrio.
(c)Gás oxigênio.
(d)Água.
(e)Gás Nitrogênio.

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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.