During charging a system with a normal charge, the refrigerant should be charged in which state through the liquid-line service valve?

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Charging through the liquid-line service valve is done with the refrigerant in liquid form. Introducing liquid refrigerant into the system ensures it flows through the metering device into the evaporator, where it flashes to vapor as it absorbs heat. This provides a predictable, accurately weighed charge and helps prevent issues from gas pockets or improper lubrication. Charging as vapor would inject mostly gas, making it hard to achieve the correct charge and can lead to poor cooling performance or compressor problems. The liquid-line service valve is specifically intended for liquid charging, so the normal practice is to add liquid refrigerant.