In 1993, the U.S. government instituted a requirement that all room air conditioners sold in the United States must have an energy efficiency ratio (EER) of 10 or higher. The EER is defined as the ratio of the cooling capacity of the air conditioner, measured in British thermal units per hour (Btu/h), to its electrical power requirement in watts.

What is the appropriate name for this dimensionless quantity?

The appropriate name for the dimensionless quantity defined as the ratio of the cooling capacity of the air conditioner (measured in British thermal units per hour, or Btu/h) to its electrical power requirement in watts is the Coefficient of Performance (COP).

COP is a measure of the efficiency of the air conditioner, specifically in terms of how much cooling it can provide per unit of electrical power consumed. A higher COP value indicates a more energy-efficient air conditioner, as it can produce more cooling output with less electrical input. In the context of the given scenario, the EER requirement of 10 or higher reflects the desired level of energy efficiency mandated by the U.S. government.

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