What is protein - according to chemistry?
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Why does the filament of an electric lamp glow, when current passes through it ?
Why is air removed from the electric lamps ?
How is cement manufactured ?
Why are wires used to carry electricity ?
In winter, on a cold morning, the cement feels colder to the foot than a carpet. Why ?
Why does the snow on the mountains not melt all at once, not changed into water very slowly?
What is Distillation ?
Why dies thermos flask keep a hot liquid hot and a cold liquid cold ?
1 Answers College School Exams Tests,
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?
Why are leaves of trees green ?
How many electrons does benzene have?
What is the prime constituents of cement?