Cu

Cu
Copper is a reddish coloured metal which is malleable and ductile. It has excellent thermal and electrical conductivities and good corrosion resistance.
Cu2O
Chemical formula for Copper I Oxide.
Cu2S
Chemical formula for Copper I Sulphide.
Cube
A solid figure bounded by 6 congruent squares.
Cubic Centimetre
Abbreviated as cm3 or cc.
Cubic Equation
An equation of the third order.
Cubic Foot
1 cubic foot = 0.0283168 m3
Cubic Foot per Minute
British imperial unit of flow rate.
Cubic Foot per Second
British imperial unit of flow rate.
Cubic Inch
The cubic inch has traditionally been used in American to define the swept volume of internal combustion engines.
Cubic Metre
SI unit of volume.
Cubic Nitre
Name for the crystallised form of Sodium Nitrate.
Cubic Yard
1 cubic yard = 0.764555 m3
Cubit
Unit of length equal to 457.2x10-3m.
CuBr
Chemical formula for Copper I Bromide.
CuBr2
Chemical formula for Copper II Bromide.
CuCl
Chemical formula for Copper I Chloride.
CuCO3
Chemical formula for Copper II Carbonate.
cufm
Cubic foot per minute, a British imperial unit of flow rate.
CuI
Chemical formula for Copper I Iodide.
CuInSe2
Chemical formula for Copper Indium Diselenide.
cumec
A unit of flow rate and an abbreviation of cubic metres per second.
Cumulative Frequency
The number of observations falling in a given class in a frequency table, plus all observations falling in earlier classes.
Cumulative Probability
The probability that a random variable will be less than or equal to a specified value.
Cumulative Relative Frequency
The number of observations falling in a given class in a frequency table, plus all observations falling in earlier classes, divided by the total number of observations.
Cumuliform
Clouds composed of water droplets that exhibit vertical development.
Cumulonimbus
A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud.
Cumulonimbus Mammatus
A portion of a cumulonimbus cloud that appears as a pouch or udder on the under surface of the cloud.
Cumulus
One of the three basic cloud forms.
Cumulus Fractus
Cumulus clouds that appear in irregular fragments.
Cumulus Humilis
Cumulus clouds with little or no vertical development characterized by a generally flat appearance.
Cumulus Mediocris
Cumulus clouds characterized by moderate vertical development with upper protuberances not very marked in appearance.
Cunife
An alloy of copper, nickel, iron, and in some cases cobalt.

Cunit
Measure of wood volume used in forestry equal to 100 cubic feet.
CuO
Chemical formula for Copper II Oxide.
Cup Anemometer
A rotation-type anemometer consists of an array of three, or more, hemispherical cups mounted symmetrically about a vertical rotation axis.
Cup Fracture
Fracture, frequently seen in tensile test pieces of a ductile material, in which the surface of failure on one portion shows a central flat area of failure in tension, with an exterior extended rim of failure in shear.
Cupola
A cupola is a short windowed tower, or dome, typically located in the center of a flat or low-slope roof.
Cupric Bromide
Old name for Copper II Bromide.
Cupronickel
An alloy of copper and nickel that is resistant to corrosion.

Cuprum
The old name for Copper and from where the chemical symbol Cu was derived.
Cure
To irreversibly polymerize a thermosetting plastic by subjecting it to a time-temperature profile.
Cure Temperatur
The temperature at which a material attains final cure.
Curie
Unit of radioactivity equal to 3.7x1010Bequerels.
Curie Constant
A characteristic constant, dependent on the material in question, which indicates the proportionality between its susceptibility and its thermodynamic temperature.
Curie, Pierre & Marie
French physicists, researched radioactivity.
Curie Temperature
The temperature above which a ferromagnetic or ferrimagnetic material becomes paramagnetic.
Curie′s Law
The susceptibility of an isotropic paramagnetic substance is related to its thermodynamic temperature.
Curie-Weiss Law
More general form of Curie′s law, which states that the susceptibility of a paramagnetic substance is related to its thermodynamic temperature.
Curing Agent
A catalytic or reactive agent that brings about polymerization when it is added to a resin.
Curium
Man-made radioactive element.
Current
Current is often used to transmit signals in noisy environments because it is much less affected by environmental noise pick-up.
Current Density
Amperes per unit area.
Current Drain
The amount of current used by a device.
Current Rating
The safe current-carrying capacity of a wire or cable on a continuous basis.
Current Regulator
A circuit that provides a constant current output.
Current Shunt
A resistor that converts a current signal to a voltage signal.
Current Sink
This refers to a sensor output configuration which switches a voltage to the negative side of the power supply.
Current Source
This refers to a sensor output configuration which provides a source of current to the load.
Current Standing Wave Ratio
The ratio of maximum to minimum current along a transmission line.
Current Transformer
Used for measurement of electric currents where the current is too high to measure directly.
Cursor
A bright figure used as a pointer on a computer screen.
Curtain Wall
A connecting wall hung between towers of a castle.
Curvature
Departure from flatness of a surface. Defined as the reciprocal of the radius of curvature.
Curve Sketching
When sketching a curve there are a number of general features to look for.
CuS
Chemical formula for Copper II Sulphide.
cusec
Abbreviation of cubic foot per second.
CuSO4
Chemical formula for Copper Sulphate.
Cut and Cover
A method of tunnel construction that involves digging a trench, building a tunnel, and then covering it with fill.
Cutoff
A transistor operating mode where very little current flows between the collector and emitter.
Cutoff Frequency
The cutoff frequency of an anechoic wedge or set of wedges is the lowest frequency above which the normal incidence sound absorption coefficient is at least .990
Cutoff Voltage
Specified closed circuit voltage at which a cell is terminated.
Cutting Fluid
A liquid used to cool and lubricate the cutting to improve the work surface finish.
Cutting Speed
The surface speed of the workpiece in a lathe or a rotating cutter.
Cutting Tool
A hardened piece of metal that is machined and ground so that it has the shape and cutting edges appropriate for the operation for which it is to be used.
Cutting Torch
A device used in gas cutting for controlling the gases used for preheating and the oxygen used for cutting the metal.