Marine Engineering Practice Exam 2026 - Free Marine Engineering Practice Questions and Study Guide

Air under pressure stores energy in a form we call pneumatic energy. When air is compressed, its pressure rises and energy is stored in the gas; that energy can be released as the air expands to push pistons, actuators, or tools. This is what pneumatic systems in marine engineering rely on for actuation and control.

Hydraulic energy, by contrast, comes from pressurized liquids; they are far less compressible, so the energy transfer behaves differently. Potential energy is energy due to position or height, not the state of a gas under pressure. Electrical energy involves energy carried by electric charges and fields, not air pressure.