A pressure cooker cooks much faster than an ordinary pot by maintaining a higher pressure and temperature inside. The lid of a pressure cooker is tightly sealed, and steam can only escape through an opening in the middle of the lid. A separate piece of metal, the purge valve, sits above this opening, preventing steam from escaping until the force of the pressure overcomes the weight of the purge valve. The periodic exhaust of the steam thus prevents any dangerous build-up of pressure, and maintains the internal pressure at a constant value. Determine the mass of the purge valve of a pressure cooker whose operating pressure is 100 kPa gauge and has a cross-sectional area of the opening of 4 mm^2. Assuming an atmospheric pressure of 101 kPa, draw the free-body diagram of the bleed valve.

Olla de presin