After liquid has been removed from a 350-ton low-pressure appliance, how much vapor refrigerant approximately remains?

In the scenario of a 350-ton low-pressure appliance, the amount of vapor refrigerant that remains after the liquid has been removed can be calculated based on the characteristics of low-pressure systems and their refrigerant capacities.

Low-pressure appliances typically hold a significant volume of refrigerant in both liquid and vapor forms. A 350-ton unit implies a substantial refrigerant charge due to its size, frequently requiring hundreds of pounds of refrigerant for effective operation.

When the liquid refrigerant is removed, there is still a substantial quantity of vapor remaining because the refrigerant does not completely evaporate or escape during the removal of the liquid phase. Given the nature of low-pressure systems, it is expected that a considerable amount of vapor refrigerant remains after liquid extraction, which is usually expressed in pounds.

The correct answer, 100 pounds, reflects a reasonable approximation for how much vapor is typically retained in a system of this capacity after the liquid phase has been evacuated. This amount considers the vapor's ability to fill the remaining space in the appliance and that not all refrigerant can be extracted as liquid, reinforcing the operational realities and engineering principles behind low-pressure refrigeration systems.