Which of the following devices operates based on Pascal's Law? Barometer ThermometerHydraulic JackCompass

The device that operates based on Pascal's Law among the options given is the Hydraulic Jack.

Here's a step-by-step explanation:

1. Pascal's Law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container.

2. A hydraulic jack operates based on this principle. It uses a fluid, which is incompressible, that is forced into a cylinder by a pump plunger.

3. When the plunger is pushed down, the fluid is forced into a second cylinder, exerting a force on the car. Because the fluid is incompressible, the size of the force remains constant, allowing a small force on the plunger to lift a heavy car.

4. Therefore, the hydraulic jack is the device that operates based on Pascal's Law.

The other devices listed (Barometer, Thermometer, Compass) do not operate based on Pascal's Law. A barometer measures atmospheric pressure, a thermometer measures temperature, and a compass shows the direction relative to the geographic cardinal directions.