This process repeated over and over keeps everything at proper temperature. If air is introduced to the cooling system, it can get trapped and form a bubble in the liquid. This prevents the continual flow of liquid, and can create hot spots in the cooling system, depending on where the air is trapped.
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African culture in Brazil â Salvador, in Bahia state, northeast Brazil, is the country's third largest city and was the country's first colonial capital. It has strong African roots and is the center for Afro-Brazilian culture.