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.
The number of alarms corresponds to the number of firefighters called to the scene. But there's no simple relationship between the two. A two-alarm designation doesn't mean you're calling in two companies, two brigades, two firehouses, or twice as many people as you would call in for a one-alarm. The precise meaning of an alarm varies depending on the fire department. In New York City, dispatchers send out 25 units and 106 firefighters for a two-alarm fire, 33 units and 138 firefighters for three alarms, 39 and 168 for four, and 44 and 198 for five. Advertisement A unit can refer to any kind of firefighting vehicle: for example, a fire engine, a ladder truck, or even a civilian carâsometimes called a buggyâfor the fire chief. In most cities, dispatchers will respond to a one-alarm fire with three or four units and then send a few more for each additional alarm.