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Qu- Quad
- Unit of energy equivalent to 1e15 BTU.
- Quadratic Equation
- An equation of the second order.
- Quadridecagon
- A 14 sided polygon.
- Quadrilateral
- A four sided polygon.
- Quadrillion
- A number equal to 1015.
- Quality Factor
- The quality factor defines the sharpness of resonance.
- Quanta
- The plural of quantum, the smallest unit of a discrete property.
- Quantization Error
- When a continuous time signal is digitized, because there isn′t an infinite number of discrete digital levels, the difference between the actual analog value and the digital representation of that value is defined as the quantization error.
- Quantum
- The smallest unit of a discrete property.
- Quantum Charge Ratio
- h/e = 4.135708x10-15 JsC-1
- Quantum Mechanics
- The rules for the behavior of particles at the atomic and subatomic levels.
- Quantum Number
- A number giving the value of a quantized quantity.
- Quark
- A constituent of hadrons. Quarks come in six flavors and three colors each.
- Quart
- A unit of volume.
- Quarter
- One of four equal parts. An outdated British unit of weight 1 quarter = 28 pounds (lb).
- Quarter Wave Tube
- A resonator used most commonly on automotive air intake systems to reduce resonance.
- Quartet
- A group of four items.
- Quartic
- A polynomial equation of degree 4.
- Quartiles
- Statistics which divide the observations in a numeric sample into 4 intervals, each containing 25% of the data.
- Quartz
SiO2 Found naturally as faceted crystals. Its birefringent properties are used in the production of optical quarter-wave plates and polarizers. - Quasi Static
- Refers to forces or displacements which vary slowly with time.
- Quaternary
- The geological period covering about 2 million years ago to the present.
- Quench Hardening
- Hardening a ferrous alloy by austenitizing and then cooling rapidly enough so that some or all of the austenite transforms to martensite.
- Quenching
- Rapid cooling.
- Quicklime
- Another name for Calcium Oxide.
- Quicksilver
- Ancient name for Mercury.
- Quiescent Current
- The standing current that flows in a circuit when the signal is not applied. The quiescent current is usually very low or lower than when processing a signal.
- Quintal
- A hundredweight in the metric system, 100kg.
- Quintic
- A polynomial equation of degree 5.
- Quintile
- Statistics which divide the observations in a numeric sample into 5 intervals.
- Quintillion
- A number equal to 1018.
- Quire
- 25 sheets of paper.
- Quod Erat Demonstrandum
- Normally abbreviated as QED and used to denote the end of a proof.
- Quotes
- Famous quotes from science and engineering.
- Quotient
- The result when one number or quantity is divided by another.
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