An animation showing the relationship between pressure and volume when amount and temperature are held constant. Boyle's law (sometimes referred to as the BoyleâMariotte law, or Mariotte's law) is an experimental gas law that describes how the pressure of a gas tends to increase as the volume of the container decreases.
Multiple-alarm fire. One-alarm, two-alarm, three-alarm fires, are categories of fires indicating the level of response by local authorities, with an elevated number of alarms indicating an increased number of phone alarms went off during the fire. The term multiple-alarm is a quick way of indicating that a fire is severe and is difficult to contain.
Like most, I always assumed that a smoke alarm was a smoke alarm. What I now know is that there are two basic types of smoke alarms; Ionization and Photoelectric. In real-world fatal fires, these alarms behave very differently.In this case different is not good.he smoke alarm industry is quick to point out that all smoke alarms must meet the UL 217 and UL 268 standards developed by Underwriters Lab (UL) to be installed in US homes. Canadian alarms have somewhat different UL-Canada (ULC) standard.