What is most often used as a secondary refrigerant in geothermal systems?
What will be an ideal response?
Water or a mixture of water and anti-freezesuch as propylene glycol, methanol, or ethanol.
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Coolers use what are called ____________________, where a liquid refrigerant is evaporated in low pressure, the cooled gas is absorbed into a second liquid, and then the second liquid/absorbed refrigerant is reheated to evaporate the refrigerant and send it back to the cycle.
Fill in the blank(s) with the appropriate word(s).
Each American farmer provides food and fiber for approximately how many people?
a. 150 c. 750 b. 300 d. 1000
In the following problems, 10 micrometers are shown. The size of each micrometer is indicated under it. Determine the correct reading for each and record it in the space provided.
Fill in the blank(s) with the appropriate word(s).
Bacteria multiply at amazing speeds in only half a day, a single bacteria cell can produce this many more:
What will be an ideal response?