High and Low side a/c

Always good to learn something from a seasoned veteran. I wonder why they always call the low side the "liquid line"?

I think you are confused, Mike. You have the output of the condenser, or if equipped the receiver dryer. That line is liquid and feeds the metering device which is immediately attached to the evaporator. The liquid boils to mostly vapor and a little liquid in the evap and continues to boil into more vapor / bit of liquid as it leaves the evap into the suction line. THAT is the low side. From there to the compressor, sometimes through an oil accumulator or other device. Out of the compressor is the "hot gas" line and goes back to the condenser. From the condenser the liquid goes (if equipped) into the receiver dryer.