Why pressure cooker is closed system?

A pressure cooker is considered a closed system because it prevents the escape of steam and vapor, creating a sealed environment that allows pressure to build up inside.

Here's why:

* Sealed Lid: The most important feature is the tightly fitting lid with a gasket that creates a seal. This prevents any steam or vapor from escaping.

* Pressure Valve: A pressure valve is incorporated to regulate the internal pressure. While it allows some steam to escape, it prevents the pressure from exceeding a safe limit.

* No Openings: Unlike open pots where steam can freely escape, pressure cookers are designed with no other openings, ensuring a closed system.

Why is this important?

* Increased Pressure: The closed system traps the steam and water vapor, leading to increased pressure inside the cooker. This higher pressure raises the boiling point of water, allowing food to cook faster.

* Faster Cooking: Since the water boils at a higher temperature, food cooks more quickly and efficiently.

* Nutrient Retention: The faster cooking time reduces the amount of time food is exposed to heat, potentially preserving more nutrients.

Therefore, the closed system nature of a pressure cooker is essential for its functionality, enabling it to operate at high pressures, cook food rapidly, and potentially retain more nutrients.