Which of the following statements about gauge pressure and absolute pressure is true?
They are both a measure of the difference between the pressure in a system and the external, atmospheric, pressure.
They are both a measure of the raw pressure in a system and don't depend on any other pressure.
Absolute pressure measures the raw pressure in a system and doesn't depend on any other pressure. Gauge pressure measures a pressure difference between a vessel and the external, atmospheric, pressure.
Gauge pressure measures the raw pressure in a system and doesn't depend on any other pressure. Absolute pressure measures a pressure difference between a vessel and the external, atmospheric, pressure.
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