Appendix F — Glossary

140 terms, alphabetical. References point to the chapter or appendix of first substantive use.

Term	Definition	Ch
Acceptance test	Declared measurement a result must pass, under stated conditions, before a process or capability counts as complete	App A
Alloy	Metal deliberately mixed with other elements for property control	10
Amortization	Spreading an asset's cost over its useful life or number of uses	39
Annealing	Heating work-hardened metal so it recrystallizes, softening it and relieving stress (steel needs slow cooling afterwards; copper does not)	14
Antifragility	Property of gaining strength from stressors rather than merely surviving them	47
Antimicrobial stewardship	Right indication, agent, dose, route, and evidence-based duration, with surveillance, to slow resistance	31
Armature	Rotating coil assembly of a motor/generator	26
Band gap	Energy range electrons can't occupy; separates conductors/semiconductors/insulators	35
Baseload demand	The portion of demand present across much of the day; plant designed to run continuously is baseload generation	43
Bellows	Collapsible air pump forcing draft into fires/furnaces	1
Bessemer process	Steelmaking by blowing air through molten pig iron to burn out carbon	27
Black start	Restoring a power grid from total shutdown using generation that can start without external supply	43
Bloomery	Furnace producing spongy iron bloom below iron's melting point	14
Bond (finance)	Tradeable debt instrument paying interest over fixed term	51
Capability gate	Set of acceptance tests a society must pass before relying on a capability; the unit of Appendix A	App A
Capacitance	Charge stored per volt across plates; Leyden jar property	25
Capacity factor	A plant's actual energy output divided by its output at full rated power over the same period	37
Carnot efficiency	Maximum heat-engine efficiency: 1 − T_cold/T_hot	23
Catalyst	Substance accelerating reactions without being consumed	28
Cementation (brass)	Making brass by heating copper with zinc ore and charcoal in a closed crucible so zinc vapour dissolves into the copper	10
Clinker	Fused cement-kiln product ground into Portland cement	27
Coal dust explosion	Explosion propagated by fine coal dust raised and ignited, often by a methane blast; controlled by wetting and inert rock dust	13
Collateral	Asset pledged against loan default	9
Commutator	Rotating switch converting generator AC output to DC	26
Competence gate	Statement of the trained people, supervision, facilities, procedures, and law a hazardous activity requires	17
Containerization	Standardized freight boxes enabling mechanical intermodal handling	47
Control chart	Plot of a process measurement against statistically derived limits that separates assignable causes from routine noise	47
Coppicing	Cutting trees at the stump on a rotation so they regrow many poles; sustainable fuelwood	1
Criticality (k=1)	Chain reaction exactly sustaining neutron population; reactor steady state	37
Crosslinking	Chemical bonds joining polymer chains into permanent networks	38
Crucible	Ceramic vessel holding metal during melting/refining	10
Cupellation	Refining silver or gold by oxidising the lead they are dissolved in, in a porous hearth under an air blast	10
Cupola	Vertical coke-fired shaft furnace for remelting iron in a foundry	22
Cyanotype (blueprint)	Iron-salt photographic copying process giving white lines on Prussian blue; the standard copy of engineering drawings	21
Decarburization	Loss of carbon from steel or iron — deliberate in refining, damaging when hot hydrogen or oxidizing heat strips it from a part	32
Defense in depth	Several independent protective layers, so no single failure causes harm	37
Delta-v (Δv)	Total velocity change a rocket can produce; orbital budget currency	39
Derivative (rate of change)	Slope of a quantity against time or distance; velocity is the derivative of position	12
Dielectric	Insulating material between capacitor plates storing field energy	25
Dispersion (optics)	Refraction varying by wavelength; causes chromatic aberration	19
Distribution shift	Change between the data a model was trained on and the conditions it meets in use	46
Doping	Adding trace impurities to semiconductors to set carrier type/density	35
Double-entry bookkeeping	Recording each transaction twice so books must balance by construction	47
Duck curve	Daily net-demand shape when midday solar output deepens the trough and steepens the evening ramp	43
Equilibrium (chemical)	Forward/reverse reaction rates balancing; Haber-Bosch yield limiter	32
Exothermic/endothermic	Reaction releasing/absorbing heat	17
Externality	Cost/benefit of activity falling on parties not party to it (pollution classic)	28
Fermentation	Microbial conversion of sugars to alcohol/acids/CO₂	4
Flux	Additive cleaning melts or promoting fusion (welding/soldering/smelting)	14
Fractional distillation	Separating liquid mixtures by boiling-point fractionation in columns	28
Frequency response	System output behavior across input frequencies; filter/amplifier spec	34
Futures contract	Agreement to trade an asset at set price/date; hedging tool	47
Gear train	Meshed gear sets transmitting exact speed/torque ratios	15
Germ theory	Specific microbes cause specific diseases; sanitation's foundation	30
Goodhart's law	When a measure becomes a target, it ceases to be a good measure	47
Grafting	Joining a scion of a chosen plant variety onto a rootstock so the variety can be copied as a clone	7
Gray (Gy)	Unit of absorbed radiation dose: one joule per kilogram	37
Haber-Bosch	High-pressure catalytic ammonia synthesis breaking agriculture's nitrogen wall	32
Half-life	Time for half of radioactive material to decay	37
Hard prerequisite	Capability that cannot be produced reliably without another already existing	App A
Heterosis	Hybrid vigour: crosses of inbred lines out-yielding either parent	32
Hot blast	Furnace air preheated by waste heat before entering the tuyères; cuts fuel per ton	22
I-MR chart	Individuals and moving-range control chart for processes that yield one value per period	47
Incident command	Single named commander with assigned leads for rescue, medical, supplies, and messages during an emergency	6
Induction (electromagnetic)	Changing magnetic flux inducing current in nearby circuits	25
Integral (accumulation)	Area under a rate curve, giving a total; the inverse of the derivative	12
Isotope	Atoms of same element with different neutron counts/masses	37
Jump	Skipping or compressing a historical stage; legal only when the five-part test of Appendix C passes	App C
Kessler syndrome	Cascade of orbital collisions whose debris makes further collisions likely	40
Latent heat	Energy absorbed/released at phase change without temperature change	23
Learning rate	Fractional cost decline for each doubling of cumulative production	43
Levigation	Separating fine clay from grit by suspending it in water and decanting	5
Lignin	Complex wood polymer that resists some chemical pulping and promotes yellowing; oxidation products contribute strongly to paper ageing	18
Limit gauge	Fixed GO/NO-GO gauge pair that accepts or rejects a part dimension without reading a scale	15
Liquidity	Ease of converting assets to cash without value loss	9
Lithography	Printing from a flat surface on which a greasy image accepts ink and wetted areas repel it	18
Martensite	Hard steel microstructure formed by rapid quenching	14
Mass ratio	Rocket's fuelled mass divided by its empty mass; set by the rocket equation	39
Metrology	Science of measurement standards and calibration chains	20
Mole (chemistry)	Amount of substance containing 6.022 × 10²³ particles; an element's atomic mass in grams	21
Mordant	Metal salt, typically alum, that binds a dye to fibre	3
MOSFET	Metal-oxide-semiconductor field-effect transistor; a gate voltage controls a channel through a thin oxide, with almost no gate current	35
N-1 contingency	Planning rule that a credible single failure must not cause unacceptable loss of service	43
Ohm's law	V = I·R; voltage equals current times resistance	25
Orphan source	Radioactive source that has left regulatory control, such as one abandoned in a disused clinic	37
Orthographic projection	Engineering-drawing method showing a part in aligned square-on views	15
Oxidation-reduction	Electron-transfer reaction pair; kiln atmospheres, smelting, and combustion are all examples	5
pH	Acidity/alkalinity logarithmic scale	21
Photolithography	Light-through-mask pattern transfer defining semiconductor layers	35
Planar process	Oxide-passivated, photolithographically patterned transistor fabrication	35
Polarization (batteries)	Gas buildup degrading cell output under load	25
Polymerization	Monomers chaining into macromolecules	38
Positional notation	Digit values depending on place; zero as placeholder enables algorithms	12
Pozzolana	Volcanic ash reacting with lime for water-setting concrete	17
Pre-stressed concrete	Concrete compressed via tensioned cables before service loads arrive	27
Principal-agent problem	Incentive misalignment between delegators and delegates	47
Process capability	Comparison of tolerance width with process spread (e.g. tolerance ÷ 6σ̂); meaningful only for a stable process	15
Producer gas	Combustible CO/H₂/N₂ gas made by drawing air through hot wood or charcoal; runs engines when liquid fuel is scarce	29
Puddling	Stirring molten pig iron in a reverberatory furnace to burn out carbon, giving wrought iron	22
PUE	Power usage effectiveness: total data-centre power divided by IT equipment power	42
Pyrometric cone	Ceramic witness piece that bends at a known heat-work, showing when a firing is complete	5
Quenching	Rapid cooling hardening steel by trapping martensite	14
Rational subgroup	Small set of consecutive measurements taken so that only short-term variation lies within it	47
Recombinant DNA	Splicing DNA segments into vectors for replication/expression	44
Refractory	Heat-resistant furnace lining material, such as fireclay, silica, or magnesite brick	5
Reinforcement ratio	Steel area ÷ concrete area governing beam design	27
Rent-seeking	Extracting wealth via gatekeeping rather than production	47
Residual magnetism	Remnant magnetization enabling generator self-excitation	26
Retting	Soaking or dew-exposing plant stems so microbes loosen bast fibre from the stalk	3
Reverberatory furnace	Flame passes OVER hearth separating fuel from charge	22
Ring vaccination	Vaccinating the contacts, and contacts of contacts, around each detected case	31
RTG	Radioisotope thermoelectric generator powering deep-space craft	37
Safety factor	Ratio by which tested strength exceeds working stress, set by code to cover uncertainty and consequence of failure	27
Salinization	Salt accumulation ruining irrigated soils; a documented stress on southern Mesopotamian farming	7
Schmutzdecke	Biologically active surface layer of a slow sand filter that removes many pathogens	30
Sievert (Sv)	Unit of effective radiation dose, weighted for radiation type and tissue sensitivity	37
Sintering	Powder particles fusing below melting point under heat/pressure	5
Slag	Molten waste rock skimmed/tapped from smelts	10
Specific impulse (Isp)	Thrust per unit propellant weight flow, in seconds; proportional to exhaust velocity	39
Stoichiometry	Quantitative ledger of reactants and products in a balanced chemical equation	21
Sulfation	Hard lead-sulfate crystals that form on lead-acid battery plates left discharged, permanently reducing capacity	26
Superalloy	Nickel/cobalt alloys retaining strength near melting; jet turbine enabler	33
Taylor's principle	GO gauges check the full form at maximum material; NO-GO gauges check single dimensions; gauge zones sit inside the tolerance	15
TCP/IP	Layered internet protocol suite; end-to-end principle embodiment	42
Tempering	Reheating hardened steel to trade hardness for toughness	14
Tensile strength	Maximum pulling stress before failure	27
Thermocouple	Two dissimilar metals reading temperature via generated voltage	20
Transformer	Static device transforming AC voltage up/down via coupled coils	26
Triage	Sorting casualties by urgency so that care goes first to those it can save	6
Trilateration	Position solving from distances to known points; GPS method	40
Turbine (steam)	Machine that turns steam expansion directly into shaft rotation through rows of nozzles and blades	23
Tuyère	Nozzle delivering bellows air into furnaces	14
Vapor pressure	Pressure exerted by evaporating liquid; distillation driver	17
Ventilated improved pit (VIP)	Pit latrine with a darkened shelter and screened vent pipe that carries odour and flies away	30
Water activity (aw)	Free water available to microbes; below about 0.6 none can grow	4
Watt (W, kW)	Power unit: one joule per second; 1 kW = 1,000 W	8
Work hardening	Strengthening metal through plastic deformation	10
Yield point	Stress where permanent deformation begins	27
Young's modulus	Stiffness of a material: stress divided by strain in the elastic range	27
Zero (placeholder)	Positional notation's enabling digit; arithmetic algorithm unlocker	12