**Advantages of Square Calibration Chambers**  

1. **Structural Rigidity**  

   - Square chambers offer high mechanical stability due to their flat surfaces and right-angle joints, reducing deformation under high pressure.  

2. **Space Efficiency**  

   - Rectangular/square designs maximize usable space for mounting multiple sensors, fixtures, or reference instruments, ideal for multi-device calibration setups.  

3. **Ease of Fabrication**  

   - Flat panels simplify manufacturing (welding, machining) compared to cylindrical chambers, lowering production costs and tolerancing challenges.  

4. **Modular Compatibility**  

   - Easily integrated with standardized lab equipment (racks, shelves) and auxiliary systems (piping, valves) due to straight edges and uniform geometry.  

5. **Uniform Flow/Pressure Distribution**  

   - Sharp corners can be designed with flow guides or baffles to minimize turbulence, ensuring consistent pressure fields in fluid-based calibration.  

6. **Accessibility**  

   - Wide, flat surfaces simplify installation, maintenance, and inspection (e.g., sensor placement, leak detection).  

7. **Thermal Management**  

   - Efficient heat dissipation across flat walls aids temperature control in thermal calibration scenarios.  

**Common Applications**: Hydraulic/pneumatic calibration, multi-sensor batch testing, and industrial environments requiring robust, scalable setups.  

**Note**: While square chambers excel in rigidity and space utilization, cylindrical designs may still dominate ultra-high-pressure applications due to superior stress distribution.