(Answered) Hello please answer the followingexplain why brakes fail in

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Hello, please answer the following;

Explain why brakes fail in a hydraulic braking system when air gets into the system.
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator.
Explain why in water, the meniscus in the capillary tube is higher than the meniscus in the beaker, while in mercury the meniscus in the capillary tube is lower than the meniscus in the beaker.

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