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Browse key terms and definitions across all GCSE subjects. Search by keyword or filter by subject and exam board.
23,110 key terms
Flood risk management plan
A plan setting out objectives and proposed measures for managing significant flood risk.
Flood-risk map
A map showing how the likelihood or potential effects of flooding vary between locations, according to its key and stated assumptions.
Flood wall
A wall built along a riverbank to contain higher water levels and protect land behind it.
Flora
The plants found in a particular region or habitat.
Flotation
The process of offering a company’s shares for sale on a stock market.
Flouring
Dusting a greased cooking surface with flour, distributing it evenly and removing the excess to help prevent sticking.
Flow
The movement of people, water or other material between places, described by its direction and amount over time.
Flowchart
A diagram that represents an algorithm using symbols joined by arrows to show the flow of control.
Flowchart
A graphical representation of a sequence of instructions, with arrows showing the order of execution.
Flow diagram
A diagram using connected symbols and arrows to show a sequence of actions and decisions.
Flower war
A battle arranged between opposing states, particularly to capture warriors for religious sacrifice rather than necessarily to conquer territory.
Flower Wars
Battles fought to capture warriors for human sacrifice, including conflicts between the Mexica and Tlaxcalans.
Flowery war
An organised conflict fought to obtain prisoners for religious sacrifice rather than simply to conquer territory.
Flow-line map
A map using lines of different widths to represent the size of movements between places; arrows can indicate direction.
Flow lines
Lines on a map that show movement between places, with the width of each line in proportion to the amount moving.
Flow meter
An instrument used to measure the speed of flowing water.
Flow production
A production method in which products pass through a continuous sequence of operations at workstations or machines on a production line.
Flow/reflow soldering
A process in which solder on PCB contact pads is heated until it melts and flows, then cools to form joints connecting surface-mounted components to the board.
Flue gases
The gases released after a fuel is burnt in a furnace or power station.
Fluency
The smooth, flowing execution of a movement, with its parts linked without unnecessary pauses or hesitation.
Fluid
A substance that can flow and may be either a liquid or a gas.
Fluid
A substance that can flow, such as a liquid or a gas.
Fluid balance
The balance between water entering the body and water leaving it.
Fluorescence
The emission of visible light by a substance after it has absorbed radiation such as ultraviolet.
Fluorescence
The absorption of radiation followed by the emission of light; for example, a fluorescent coating absorbs ultraviolet and emits visible light.
Fluorescent dye
A light-emitting label that can be attached to an antibody so that the location of a bound target can be seen.
Fluoride
A mineral that helps strengthen tooth enamel and protect teeth against decay.
Flute
A wave-shaped paper layer within corrugated board that helps provide strength, cushioning and insulating air spaces.
Fluting
The wavy paper layer between the flat liners of corrugated board, which contributes to cushioning and resistance to crushing.
Fluvial
Relating to rivers and the processes carried out by flowing river water.
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