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Concepts

Ideas, terms, and mechanisms explained clearly.

A fire alarm control panel, the central component of a building fire detection and alarm system

Fire Protection System

A fire protection system is the combination of detection, alarm, suppression, and passive design features built into a structure to detect a fire early, alert occupants, limit its spread, and in many cases extinguish it automatically before firefighters arrive. Fire protection engineering treats these elements as a layered, redundant system rather than relying on any

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The combination of detection, alarm, suppression, and passive design features built into a structure to limit fire damage and protect occupants.

Fire rated wall and duct assembly construction

Fire Rated Assembly

A fire rated assembly is a building component, such as a wall, floor-ceiling assembly, or door, that has been tested under standardized conditions and certified to resist the passage of fire and maintain structural integrity for a specified duration, typically expressed in hours. Fire rated assemblies form the backbone of passive fire protection strategy, dividing

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A bright burning campfire illustrating fuel, heat, and flame

Fire Triangle

The fire triangle is a foundational concept in fire science that illustrates the three elements necessary for combustion to occur and continue: sufficient heat to raise fuel to its ignition temperature, a combustible fuel source, and an oxidizing agent, typically oxygen from the surrounding air. The model teaches that removing any one of these three

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A shower of welding sparks during hot work requiring a fire watch

Fire Watch

A fire watch is a temporary fire safety measure in which a specifically trained person patrols a building, area, or work site to detect fire hazards and respond promptly, typically implemented to compensate for a gap in normal automatic fire protection or to monitor activities that create elevated fire risk. Because a fire watch depends

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A dedicated hardware firewall appliance used to filter network traffic

Firewall

A firewall is a network security system that monitors incoming and outgoing network traffic and decides whether to allow or block it based on a defined set of security rules. Positioned at the boundary between a trusted network, such as a home or office network, and an untrusted one, such as the broader internet, a

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A network security system that monitors and filters incoming and outgoing traffic based on defined security rules.

A mother reading a picture book aloud to her two young children

First language

In simple terms A first language is the language a person acquires in childhood as a member of a speech community. It is also called a mother tongue or native language, and linguists write it as L1, with languages learned later as L2. The label describes how a language was learned, not how well someone

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A first language is the language a person acquires in childhood as a member of a speech community.

Paramedics working inside an ambulance

First Responder

A first responder is a trained individual who is typically among the earliest personnel to arrive at the scene of an emergency, responsible for conducting an initial assessment, ensuring the scene is reasonably safe to approach, and providing immediate assistance until additional resources arrive. The role spans several professions, most commonly firefighters, police officers, and

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Fiscal policy

In simple terms Fiscal policy is what a government does with its budget: how much it spends, how much it taxes, and how much it borrows to cover the difference. The IMF puts the purpose plainly. Governments use those powers to promote strong and sustainable growth and to reduce poverty. How it works There are

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Fiscal policy is a government's use of spending and taxation to steer the economy, as distinct from a central bank's interest rate decisions.

Marine cages used for Atlantic salmon fish farming

Fish Farming

Fish farming, also called aquaculture when applied to finfish, is the practice of raising fish in controlled environments such as ponds, tanks, cages, or enclosed sections of lakes and coastal waters, rather than catching them from wild populations. It now supplies more than half of all fish consumed by people worldwide, a dramatic shift from

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The practice of raising fish in controlled environments like ponds, tanks, or cages rather than catching them wild.