Er

Er
Erbium is a silvery grey metal that is a member of the lanthanide group of elements.
Er2O3
Chemical formula for Erbium III Oxide.
Eratosthenes
Around 230BC developed a method for finding all prime numbers.
ErB4
Chemical formula for Erbium III Boride.
ErB6
Chemical formula for Erbium Hexaboride.
Erbium
A silvery grey metal that is a member of the lanthanide group of elements.
Erbium Hexaboride

ErB6

A rare earth hexaboride compound which has a calcium hexaboride crystal structure.

Erbium III Boride

ErB4

It is hard and has a high melting point.

Erbium III Bromide

ErBr3

A violet crystalline solid which is highly soluble in water.

Erbium III Chloride

ErCl3

The erbium(III) salt of hydrochloric acid, is a violet solid used for the preparation of erbium metal.

Erbium III Oxide

Er2O3

Pink color with a cubic crystal structure. Under certain conditions erbium oxide can also have a hexagonal form.

ErBr3
Chemical formula for Erbium III Bromide.
ErCl3
Chemical formula for Erbium III Chloride.
Erg
Unit of energy equal to 100.0x10-9J.
Ergodic Process
A stationary random process.
Ergosphere
The region around a rotating black hole, between the event horizon and the static limit.
EROEI
Abbreviation of Energy Return on Energy Invested.
Erosion
The natural wearing away of rocks.
Erratic Error
An error caused by an incomplete element in an instrument.
error
Details of how to report errors in the Science and Engineering Encyclopaedia.
Error Correction
A method using a coding system to correct data errors by use of redundant data within a data block.
Error Detector
The component in a servosystem that determines when the load has deviated from its ordered position, velocity, and so forth.
Error Signal
The signal whose amplitude and polarity or phase are used to correct the alignment between the controlling and the controlled elements.
Errors
No measurement is exact, they all contain some degree of errors.
ERU
Unit of angular velocity equal to 15° per hour.
Erythrene
Another name for 1,3-Butadiene.
Erythritol

C4H10O4

It is 6070% as sweet as table sugar yet it is almost noncaloric, does not affect blood sugar, does not cause tooth decay, and is partially absorbed by the body, excreted in urine and feces.