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## Raoult’s law Quick reference

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

...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

...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

...= 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

...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

...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...

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