The cavity magnetron is a vacuum tube that generates microwaves using magnetic fields to manipulate streams of electrons. It was developed in 1940 and enabled the development of portable radar units. It is still used in radar equipment and microwave ovens, although newer technologies are starting to displace it in some applications. A cavity magnetron […]
A cavity wall is two walls built together with a gap between them, allowing for better insulation and moisture drainage. They are ideal for colder climates and can be further insulated. The outer layer is often bricks and the inner layer is heavier materials. Cavity walls were first used in the UK in the 19th […]
The human body has several cavities, including the ventral cavity (containing the abdominopelvic and thoracic cavities), the dorsal cavity (covering the back and containing the spinal and cranial cavities), and the pelvic cavity (containing reproductive and waste-related organs). The chest and abdominal cavities are the largest and contain vital organs. The term “body cavity” can […]
A progressing cavity pump uses a rotor to move fluid through small chambers, allowing for consistent flow and pressure control. It is used in various applications, including oil drilling, sewage systems, and chemical manufacturing. The design minimizes wear and provides precise control. It was first developed in the 1930s and has various names. Sometimes referred […]
The progressing cavity pump is a positive displacement pump that uses a helix-shaped rotor to pull fluids of varying viscosities into isolated cavities and discharge them. It is useful for wastewater management and other environments with suspended sediment. Flow rate is adjustable, and maintenance is required. Manufacturers offer a range of sizes and speeds, and […]
The body cavity, or coelom, enabled the development of larger, more complex animals. Animals with one are coelomates, while those without are acoelomates. Some animals have a pseudocoele. The cavity allows for organ movement, cushioning, and chemical exchange. Coelomates evolved from cnidarians, and acoelomates evolved from coelomate ancestors. Acoelomates tend to be flat and lack […]
The chest cavity contains vital organs such as the heart and lungs, as well as important vessels and structures. It can be divided into smaller categories such as the pleural cavities and mediastinum, which are important for medical and surgical purposes. Surgeons must be precise when operating in this area, especially on newborns. In the […]
The abdominal cavity contains important organs, including the intestines, liver, kidneys, spleen, and adrenal glands. It is lined by the peritoneum, which protects and anchors the organs. Surgery in this area carries risks, but endoscopic surgery has reduced them. The abdominal cavity is a large body cavity that contains the major viscera. This body cavity […]
