A pressure vessel is a container designed to hold gases or liquids at a pressure significantly different from the ambient pressure. These vessels are commonly used in various industries, including oil and gas, chemical processing, and power generation. They are built to withstand high pressure and temperature, ensuring safety and efficiency in operations. Pressure vessels are typically constructed from strong materials like steel or composite materials to prevent leaks and ruptures. They often undergo rigorous testing and adhere to strict regulations to ensure they can safely contain the substances within. Common examples include boilers, reactors, and storage tanks.