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E

E   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
162 words
Illustration(s):
1

Metric As an upper-case prefix, E, see exa-, e.g. Eg = exagram.

mathematics. As E, initial

golden number

golden number   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
486 words
Illustration(s):
2

The number 1.618∼, unique in that its value equals the ratio of its integer part to its fractional part, i.e.

grain

grain   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
410 words
Illustration(s):
1

Symbol gr. Adverting to the seed of wheat, barley, etc., the grain is a long-standing elementary unit for measuring mass,

horse

horse   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
233 words
Illustration(s):
1

power. Symbol h.p. BI 1809 550 ft⋅lb⋅s-1 (745.699 872∼ W), originally the rounded estimated rate of working of a

hounsfield unit

hounsfield unit   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
93 words
Illustration(s):
1

[G. D. Hounsfield; UK 1919– ]

radiation physics. Symbol H. Actually a scale, providing a fine measure

logarithm

logarithm   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
554 words
Illustration(s):
1

[Gk: λογοσ ‘ratio’]

mathematics. Symbol log. For any positive number N, and some reference base number b, also

neper

neper   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
92 words
Illustration(s):
2

[I. Nepero = J. Napier]

engineering. Symbol Ne. A geometric scale for power ratios, akin to, and

pi

pi   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
119 words
Illustration(s):
1

mathematics. Symbol π. The proportionality constant of the circle – of its circumference to its diameter and of its

Planck length

Planck length   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
188 words
Illustration(s):
1

sub-atomic physics. Units of length, mass, and time chosen to give normalized values for the Newtonian constant of gravitation

Q factor

Q factor   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
78 words
Illustration(s):
1

[quality factor]

electrics. Indicating overall conservational quality of an electric circuit,where f is frequency, L is inductance, C

tyre size

tyre size   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
824 words
Illustration(s):
2

engineering. The modern international standard notation for car-tyre size is an interesting admixture, being an alphanumeric code involving millimetres,

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