الوصف
The convection of heat in air apparatus is a metal box used in physics education to demonstrate the principle of heat convection in gases. The setup is also known as a mine shaft apparatus due to its resemblance to an early 19th-century ventilation system.
Features
- Demonstrates convection currents: The primary purpose of the apparatus is to provide a visible demonstration of how heat is transferred through a fluid (in this case, air) via convection.
- Visible airflow: The convection currents are made visible using a smoke source, such as a smoldering taper or piece of cardboard.
Procedure:
- A candle is lit and placed in the holder under one chimney. The sliding front is closed.
- The candle's heat warms the air inside the box, causing it to expand and become less dense. The buoyant, hot air rises and exits through the chimney directly above the flame.
- A smoke source is held near the mouth of the second chimney. Cooler, denser air from outside is drawn down this chimney to replace the rising hot air, pulling the smoke with it.
- The smoke provides a clear visual trail of the air's circular movement, confirming the formation of a convection current.
- Durable construction: Made of steel or other robust metal, the box is built for repeated use in a classroom or laboratory setting.
- Easy to use: The simple design and setup make it an effective and easy-to-use teaching aid for students.