Boyle's law can best be defined as which of the following?

Correct Answer: Option A — The volume of an enclosed gas varies inversely with the applied pressure, provided the temperature remains constant.

Boyle's Law states that for a fixed mass of an ideal gas at a constant temperature, the volume is inversely proportional to the pressure. This fundamental thermodynamic principle is critical in understanding the compression phase of the Brayton cycle, where air volume decreases as pressure increases within the compressor stages.