If you have to ask this question, perhaps you should not be the one adding the refrigerant. It is not a skinny or fat line, it is a liquid(or discharge) or a suction line. You would add it to the liquid line and the pressure is dependant upon several things.
Total recharge is 1.68 Lbs
Your air conditioning system holds approximately 5 pounds of Freon. Most recharge kits come with a gauge that will tell you exactly how much Freon to put into the system.
I believe it is only ounces, not pounds. If you buy the recharge cans with the gauge on them, they will get you in the ball park. You should checks for leaks first by using a vacuum pump to remove the air (and contaminants) before adding freon.
lbs is pounds.
3000 pounds of pressure they can snap a broom handle in half
You need six pounds of pressure to torque.
It would only take about 30 pounds of pressure per square inch to break a human neck. At 25 pounds of pressure, it causes instant unconsciousness.
556 pounds
35-4500 pounds
Up to 180 pounds
40 pounds
the fuel pressure should be 65 pounds of pressure