**Core Concept**
High-pressure storage of compressed gases requires materials with unique properties to prevent failure and ensure safety. Compressed gas cylinders must be fabricated from materials that can withstand the elevated pressures and resist corrosion.

**Why the Correct Answer is Right**
The correct material for high-pressure storage of compressed gases is steel, specifically carbon steel or stainless steel. These metals have high strength-to-weight ratios, allowing them to maintain their shape and integrity under extreme pressure. Additionally, steel's low permeability and resistance to corrosion make it an ideal choice for storing gases such as oxygen, nitrogen, and carbon dioxide.

**Why Each Wrong Option is Incorrect**
**Option A:** Copper is an excellent conductor of heat and electricity, but it lacks the mechanical strength and corrosion resistance required for high-pressure gas storage.
**Option B:** Aluminum has a lower strength-to-weight ratio compared to steel and is more prone to corrosion, making it unsuitable for high-pressure gas storage.
**Option C:** Glass is brittle and prone to cracking under pressure, making it an unsafe choice for storing compressed gases.

**Clinical Pearl / High-Yield Fact**
When handling compressed gas cylinders, always ensure the valve is closed and the cylinder is securely stored in a well-ventilated area to prevent accidents and exposure to hazardous gases.

**Correct Answer: D. Steel**