What is the pressure in the gas bulb connected to the mercury manometer shown in the diagram if the ambient pressure is 750 torr? The heights labeled in the diagram are 15 mm and 21 mm. 
Definitions:
Hydrogen Ions
Positively charged ions (H+) that are formed when hydrogen loses its electron and are involved in acid-base balance in the body.
ATP Production
The process by which cells generate adenosine triphosphate (ATP), the primary carrier of energy within cells.
Chemiosmosis
A process by which ATP is generated in the mitochondria through the movement of hydrogen ions across a membrane.
Inner Mitochondrial Membrane
The membrane inside mitochondria that is the site of the electron transport chain and ATP (adenosine triphosphate) production.
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