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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Non-land costs for soybeans are projected at $308 per acre in 2013, $2 per acre higher than the 2012 non-land costs of $306 per acre (see Table 1). Fertilizer costs are projected to be down in 2013: $58 per acre in 2012 compared to $53 in 2013.