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### A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
168 words

...are similar to the forces between molecules of one and molecules of the other. Deviations in Raoult’s law for mixtures of liquids cause the formation of azeotropes . The law was discovered by the French chemist François Raoult ( 1830–1901 ) in 1887. http://web.lemoyne.edu/~giunta/raoult2.html Raoult’s original paper in Comptes Rendus ... ## ampere Quick reference

### A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...would produce between these conductors a force equal to 2 × 10 -7 newton per metre of length. (This number effectively set the magnetic permeability of vacuum at 4π × 10 -7 H⋅m -1 ; see permittivity .) The following are among the coherent derived units: • A⋅m -1 for magnetic field strength, magnetization; • A⋅m -2 for current density; • A⋅s = coulomb for quantity of electricity; • A⋅s⋅V -1 = farad for electric capacitance; • A⋅V -1 = siemens for electric conductance; • A⋅H = weber for magnetic flux; • A⋅turn for magnetomotive force. This... ## SI system Quick reference

### A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...= m 2 ⋅m -2 for solid angle: degree C = degree Celsius = K for temperature C = coulomb = s⋅A for electric charge, quantity of electricity N = newton = m⋅kg⋅s -2 for force Pa = pascal = N⋅m -2 for pressure, stress J = joule = N⋅m for energy, work, quantity of heat W = watt = J⋅s -1 for power, radiant flux V = volt = W⋅A -1 for voltage, e.m.f., potential difference F = farad = C⋅V -1 for electric capacitance Ω = ohm = V⋅A -1 for electric resistance S = siemens = Ω -1 for electric conductance Wb = weber = V⋅s for magnetic flux T = tesla = Wb⋅m -2 for... ## volt Quick reference

### A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...current equals the ratio of power produced in watts to the current strength in amperes; equally the product of current strength in amperes and resistance in ohms. V = W⋅A -1 = A⋅Ω. SI , Metric-m.k.s.A. (= m 2 ⋅kg⋅s -3 ⋅A -1 in base terms). The following are among the coherent derived units: • V⋅m -1 for electric field strength; • V⋅s = weber for magnetic flux; • V⋅A for apparent power; • V⋅A -1 = ohm for electric resistance. Metric-c.g.s. See abvolt (a base unit for the e.m.u. system); statvolt. See also practical unit . UK 1 MV = 1... ## SI alphabet Quick reference

### A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...else composite) measure-unit symbol in the string. The preferred practice now is to restrict such uses of powers to exponents that are multiples of 3, i.e. to integer powers of 1 000. Thus a value that might be written as 1.732 × 10 11 should be written as 173.2 × 10 9 else 0.173 2 × 10 12 . For mass, such multipliers should apply to the kilogram; for most other circumstances they should preferably apply directly to an unqualified unit else to a string of them. Unless there is special cause, a compound expression should be resolved into standard...  View: