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sample size is the specific size of a thing like the how long or wide. while sample unit is the whole thing not referring to specific number size.
A variable that is not affected by the size of the subject (or experimental unit).
a 4 ton unit
The amount of refrigerant a unit contains depends on the size of the unit. That is the standard charge but the charge after the system is installed may be more or less. The system charge depends on the size of the refrigerant lines, the length of the lines, and the size of the unit.
This unit (not in SI) is pica; 1 pica = 4,233 33 mm.