To determine the measuring unit for the pressure of a liquid, let's examine each of the options provided:
A. Liter: This is a unit of volume, commonly used to measure liquid quantities, but it does not measure pressure.
B. Fathom: This is a unit of length, primarily used in nautical contexts to measure the depth of water. It is not used to measure pressure.
C. Gallons per minute: This is a unit of flow rate, which measures the volume of liquid that moves in a certain amount of time. It does not measure pressure.
D. Pounds per square inch (psi): This is a unit that measures pressure. Pressure is defined as force per unit area, and pounds per square inch is a common unit used to describe this measurement, particularly in the context of various liquids and gases.
Since the question asks for the unit that measures the pressure of a liquid, and pounds per square inch (psi) directly relates to pressure measurement, the correct answer is:
D. Pounds per square inch (psi)
