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.
As always, make sure to follow manufacturer's installation instructions and verify all codes and compliance with your local authority. That could include your building inspector, fire marshal or insurance bureau. There are two broad types of fire alarm systems; heat detectors and smoke alarms. Knowing the differences between the various types of fire alarms available is key to matching the appropriate product to the application. Heat detectors are the oldest type of automatic fire detection device.