Are 0 psig and 14.7 psia are 14.7 pounds apart from each other?

No, 0 psig (pounds per square inch gauge) and 14.7 psia (pounds per square inch absolute) are not 14.7 pounds apart; they represent different reference points. Psig measures pressure relative to atmospheric pressure, while psia measures it relative to a perfect vacuum. Since 0 psig means the pressure is equal to atmospheric pressure, it corresponds to 14.7 psia at sea level. Therefore, they are actually the same pressure level.