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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:
165 words
Illustration(s):
1

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

mathematics. As E, initial letter of exponent, see ...

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:
497 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:
413 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, and has been used for length too. In Britain the initial entity ... More
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:
244 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 typical horse (when trudging a circle endlessly, dragging a boom to power ... More
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:
95 words
Illustration(s):
1
[G. D. Hounsfield; UK 1919– ] radiation physics. Symbol H. Actually a scale, providing a fine measure of the attenuation of x-rays by different tissues, the unit being equal to ... More
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:
569 words
Illustration(s):
1

[Gk: λογοσ ‘ratio’]

mathematics. Symbol log. For any positive number N, and some reference base number b, also positive, the power to which b must be raised to equal ...

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:
103 words
Illustration(s):
2
[I. Nepero = J. Napier] engineering. Symbol Ne. A geometric scale for power ratios, akin to, and close to, the bel but using the natural logarithm and addressing primarily the ... More
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:
123 words
Illustration(s):
1
mathematics. Symbol π. The proportionality constant of the circle – of its circumference to its diameter and of its area to one quarter the area of the square within which it is precisely ... More
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:
79 words
Illustration(s):
1

[quality factor]

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

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:
828 words
Illustration(s):
2
engineering. The modern international standard notation for car-tyre size is an interesting admixture, being an alphanumeric code involving millimetres, inches, and a percentage. These are ... More

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