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.
Note: A smoke alarm is a unit which gives early warning of fire and is powered by a. 9 volt battery or 240 v. The alarm sounder is within the unit. A smoke detector is a unit which is powered by a fire alarm system. The alarm. comes from a sounder installed in the location of the room where the detector is. located. Special considerations The location of smoke detectors should take into. consideration areas where false operation or no-operation is likely.