Gas detector in industrial refrigeration processes and biological degradation processes, including exhaled breath. Depending on the required sensitivity, different types of sensors are used (e.g., flame ionization detector, semiconductor, electrochemical, photonic membranes). Detectors usually operate near the lower exposure limit of 25ppm; however, ammonia detection for industrial safety requires continuous monitoring above the fatal exposure limit of 0.1%. There are several different sensors that can be installed to detect hazardous gases in a residence. Carbon monoxide is a very dangerous, but odorless, colorless gas, making it difficult for humans to detect. Carbon monoxide detectors can be purchased for around US$20–60. Many local
Chainsaws in popular culture film, involved multiple victims and bodies stuffed into metal drums. DePalma described the murder as part of his appeal that "Scarface" should be passed with a R certificate on the basis that its graphic content was based in reality as screenwriter Oliver Stone had gleaned from months of research with both police officers (some of whom testified in the films defense) and actual drug traffickers. Chainsaws in popular culture Chainsaws, the common logging and woodworking tool, are also a common sight in popular culture. Chainsaws have appeared in countless films being used for their intended purpose, but this rarely if