Automobile Engineering in ME
In a ventilated disc brake

Disc contains many small holes for optimum cooling performance
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is pure sulphuric acid
The electrolyte is pure distilled water
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

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