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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In 2014, the total of all economic costs per acre for growing corn in Illinois averaged $1,045 in the northern section, $1,002 in the central section for farmland with high soil ratings, $955 in the central section for farmland with low soil ratings, and $895 in the southern section.otal costs per acre were the highest on record and total costs per bushel were the lowest in the last four years. Total cost per acre to produce soybeans increased, from $697 per acre in 2013 to $727 per acre in 2014. Generally speaking, the same expenses that increased for corn also increased for soybeans.