En

Enamel Paint
A paint which dries to a hard gloss or semi-gloss smooth finish.
Enantiomers
Stereoisomers that are nonsuperimposable complete mirror images of each other.
Encapsulated
Imbedded in solid material or enclosed in glass or metal.
Encastre
A term which describes the constraints imposed on a structure where it joins its foundations.
Encoder
A device that converts linear or rotary displacement into digital or pulse signals.
Encoder Resolution
Measure of the smallest positional change which can be detected by the encoder.
End Cutters
A pair of pliers with the cutting action on the end of the jaws.
End Fire Array
An array in which the direction of radiation is parallel to the axis of the array.
End Float
Movement of one shaft along its centreline due to the freedom of movement permitted by a journal bearing or a sleeve bearing.
End Mill
Milling cutter held by its shank that cuts on its periphery and, if so configured, on its free end.
End Point Convention
In histograms, you need to decide where to count values that are on the exact boundary between two intervals: either in the left or in the right interval.
Endergonic
Refers to a reaction for which the free energy of the system increases.
Endocytosis
Uptake of particles of food by the cell through invagination of the exterior side of the plasma membrane.
Endosome
A vesicle formed by fusion of several other vesicles which were imported into the cytoplasm by receptor mediated endocytosis.
Endothermic
Reaction that absorbs heat from its surroundings as the reaction proceeds.
Endpoint
The experimental estimate of the equivalence point in a titration.
Endurance Limit
In fatigue testing, the number of cycles which may be withstood without failure at a particular level of stress.
Energy
Energy is defined as the capacity of a body for doing work.
Energy Accounting
System used within industry, where measuring and analyzing the energy consumption of different activities is done to improve energy efficiency.
Energy Balance
The difference between the total incoming and total outgoing energy.
Energy Band
A collection of closely spaced energy levels.
Energy Conservation
Practice of decreasing the quantity of energy used.
Energy Content
Amount of energy for a given weight of fuel.
Energy Density
Characteristic parameter of a battery/electrical power source indicating the amount of electrical energy stored per unit weight or volume.
Energy Dispersive Spectroscopy
Technique based on the characteristic X-ray peaks that are generated when an energetic electron beam interacts with the specimen.
Energy Efficiency
Ratio of energy output of a conversion process or of a system to its energy input.
Energy Intensity
The ratio of energy consumption to economic or physical output.
Energy Return on Energy Invested
It is the ratio of energy generated divided by the energy required to build and maintain the equipment.
Energy Source
There are a number of different energy sources.
Energy Storage
Device or physical media that store some form of energy to perform some useful operation at a later time.
Energy Use
The use of energy by a system to perform an operation or to achieve a given task. For automotive vehicles the energy use is measured in mpg, litres/100km or for electric vehicles Wh/km.
Energy Use Reduction
With all use of energy there is a drive to reduce the consumption to reduce costs, emissions or because of availability.
Engine
A machine which produces power to do work, particularly one that converts heat into mechanical work.
Engine Bay
The enclosure in which an engine is installed in a vehicle.
Engine Block
The main structure of the engine.
Engine Breathing
The ability of an internal combustion engine to get air into the combustion chamber during the intake stroke.
Engine Configurations
Various configurations of engine have been developed over the years for power, low noise and vibration, economy or weight.
Engine Crane
A crane designed specifically for lifting engines and gearboxes into and out of vehicle engine bays.
Engine Efficiency
For thermal engines this is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work.
Engine Excitation Mechanisms
The physics behind the vibrations generated by the internal mechanisms of an internal combustion engine.
Engine Knock
Abnormal combustion, often producing audible sound, caused by autoignition of the air/fuel mixture.
Engine Mechanical Efficiency
The mechanical efficiency takes into account friction losses in the bearings, piston sliding losses and valvetrain losses. The ratio of brake power to indicated power is the mechanical efficiency.
Engine Oil
Liquid that reduces friction or wear, or both, between the moving parts within an engine; removes heat, particularly from the underside of pistons; and serves as a combustion gas sealant for the piston rings.
Engine Orders
Engine orders are simply the amplitudes of the frequency components which are the multiples of the rotating frequency.
Engine Radiated Noise
Some empirical noise prediction models have been derived from a sample of 1m radiated engine noise measurements.
Engine Speed
Rotational speed of the crankshaft, normally declared as rpm.
Engine Tuning
The adjustment, modification or design of internal combustion engines to yield optimal performance, to increase an engine′s power output, economy, or durability.
Engine Tuning to Increase Durability
The adjustment, modification or design of internal combustion engines to increase durability.
Engine Tuning to Increase Power
The adjustment, modification or design of internal combustion engines to yield more power.
Engine Tuning to Reduce Fuel Consumption
The adjustment, modification or design of internal combustion engines to yield better fuel economy.
Engine Vacuum
Air depression created by the intake stroke, pulling in the air/fuel mixture.
Engineering
A profession in which a knowledge of math and natural science is applied to develop ways to utilize the materials and forces of nature for the benefit of all human beings.
Engineering and Physical Sciences Research Council
EPSRC funds research and postgraduate training in engineering and the physical sciences at universities and other organisations throughout the UK.
Engineering Ceramics
Technical ceramics for structural applications.
Engineering Design
Lists all Engineering Design topics in the Encyclopaedia
Engineering Design Weblinks
Lists all Engineering Design Weblinks in the Encyclopaedia
Engineering Units
Units that are decided upon by an individual user or by agreement among users.
Engineers
A list of famous scientists and engineers.
Engines
Lists all Engines topics in the Encyclopaedia
Engines Books
Lists all Engines Books in the Encyclopaedia
Engines Calculations
Lists all Engines Calculations in the Encyclopaedia
Engines Conversions
Lists all Engines Conversions in the Encyclopaedia
Engines Weblinks
Lists all Engines Weblinks in the Encyclopaedia
English Bond
A particular arrangement of bricks.
Enkephalin
Molecules produced naturally by the central nervous system to numb pain.
Enneagon
A nine-sided polygon.
Entablature
The upper horizontal part of an order, between a capital and the roof; it consists of the architrave, frieze, and cornice.
Enthalpy
Change in heat.
Enthalpy of Atomization
The change in enthalpy that occurs when one mole of a compound is converted into gaseous atoms.
Enthalpy of Combustion
The amount of energy released in burning completely an amount of substance.
Enthalpy of Formation
The enthalpy change when 1 mole of a substance is formed from the elements in their standard states.
Enthalpy of Fusion
The enthalpy change that occurs to melt a solid at its melting point.
Enthalpy of Hydration
The enthalpy change associated with placing gaseous molecules or ions in water.
Enthalpy of Neutralization
The heat released by an acid-base neutralization reaction running at constant pressure.
Enthalpy of Reaction
The heat absorbed or released by a chemical reaction running at constant pressure.
Enthalpy of Solution
The enthalpy change associated with dissolving a solute in a solvent.
Enthalpy of Sublimation
The change in enthalpy when one mole of solid vaporizes to form one mole of gas.
Enthalpy of Vaporization
The change in enthalpy when one mole of liquid evaporates to form one mole of gas.
Entrained Air
A mechanical mixture of air bubbles having a tendency to separate from the liquid phase.
Entropy
Measure of the disorder of a system.
Entropy Coding
Variable length lossless coding of the digital representation of a signal to reduce statistical redundancy.
Entropy
A measure of the information contained in a message, it's the lower bound for compression.
E-number
A code that refers to a food additive.
Enumerable Set
A countable set.
Envelope of a Function
A curve that is tangent to the peaks of the function.
Envelope Volume
The external volume of a particle, powder, or monolith such as would be obtained by tightly shrinking a film to contain it.
Environmental
Lists all Environmental topics in the Encyclopaedia
Environmental Engineer
An engineer who designs and operates systems to provide safe drinking water and to prevent and control pollution in water, in the air, and on the land.
Environmental Lapse Rate
The rate at which the air temperature decreases as you move higher in the atmosphere.
Environmental Noise Modelling
Computer model used to predict the potential noise impact of a proposed new development, or modifications to an existing site. This allows noise control measures to be optimised.
Environmental Tests
A set of tests used to establish that a piece of equipment can withstand a lifetime of exposure to the environment it will have to survive.
Environmental Weblinks
Lists all Environmental Weblinks in the Encyclopaedia
Enzyme
Protein or protein-based molecules that speed up chemical reactions occurring in living things.