In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
- Area of the hole in the lid
- Temperature of the flame
- Weight of the lid
Select the correct answer using the code given below.
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Explanation
Statement 1 is correct
- The pressure cooker has a small vent hole or valve through which steam can escape. The area of this hole plays a crucial role in regulating the pressure inside the cooker. A smaller vent hole restricts the escape of steam, allowing pressure to build up more effectively, leading to a higher internal temperature.
- Conversely, a larger vent hole would allow more steam to escape, reducing the pressure and, consequently, the cooking temperature. Therefore, the area of the vent hole is directly linked to how high the pressure (and temperature) can get inside the cooker
Statement 2 is incorrect
- The flame heats the cooker and influences how quickly the cooker reaches its working pressure, but it does not directly change the temperature at which the food is cooked once the desired pressure is reached. Regardless of how hot the flame is, the pressure regulator ensures that the pressure—and thus the cooking temperature—remains constant after reaching the set level.
Statement 3 is correct
- The lid or pressure regulator’s weight is designed to maintain a specific pressure level inside the cooker. This weight determines the maximum pressure that can be achieved.
- The pressure inside the cooker dictates the boiling point of the water; higher pressure raises the boiling point, allowing food to cook at higher temperatures. A heavier weight allows for higher pressure, resulting in a higher cooking temperature, whereas a lighter weight would reduce both pressure and temperature.
- This also affects the pressure inside the cooker. A heavier lid can hold more pressure, leading to a higher cooking temperature.
