Final answer:The abbreviation PSIG stands for Pounds per Square Inch Gauge, which is a unit of pressure that indicates pressure exerted over atmospheric pressure. PSI is a broader term and can refer to either absolute or gauge pressure.Explanation:The abbreviation PSIG stands for Pounds per Square Inch Gauge. This unit of pressure measurement takes into account the atmospheric pressure and indicates how much pressure is being exerted over atmospheric pressure. In contrast, pounds per square inch (psi) is a broader term that can refer to absolute pressure, which includes atmospheric pressure, or gauge pressure, which does not.The pascal (Pa), which is the SI unit of pressure, is defined as 1 N/m², with the newton (N) being a unit of force. However, in the United States, the psi unit is commonly used, for example, to measure car tire pressure. The psi unit represents the amount of force applied over one square inch of area.One must differentiate between psi and PSIG; while psi measures pressure including the atmospheric pressure, PSIG measures only the pressure that is over and above the atmospheric pressure.Therefore answer is 1) Pounds per Square Inch Gauge....

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