Question 27Refrigeration & AC - 1st Asst/Chief

The correct answer is C) weight. The amount of HCFC-123 in a storage cylinder is measured by weight because the weight of the cylinder provides a direct measurement of the refrigerant content. The weight of the cylinder, when full, minus the tare weight (empty weight) of the cylinder gives the actual weight of the refrigerant inside. The other options are incorrect because they do not directly measure the refrigerant content. Saturation pressure and temperature (options A and B) are properties of the refrigerant, but do not indicate the quantity. Volume (option D) may vary depending on the cylinder size and would not provide an accurate measurement of the refrigerant mass.