Liquid refrigerant charging of a system is normally accomplished in the liquid line. For example, when a system is out of refrigerant, liquid refrigerant can be charged into the king valve on the...
Use a vacuum pump that pulls it into a tank.
Oil in a AC compressor is there so that the mechanical parts don't over heat from friction
Protection Structure Motility Calcium reserves Blood cell formation
with the muscular system and your circulatory system.