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= 0.514 77 3 m/s mach number: M: Ratio of the speed to the speed of sound [note 1] in the medium (unitless). ≈ 340 m/s in air at sea level ≈ 295 m/s in air at jet altitudes metre per second (SI unit) m/s ≡ 1 m/s = 1 m/s mile per hour: mph ≡ 1 mi/h = 0.447 04 m/s: mile per minute: mpm ≡ 1 mi/min = 26.8224 m/s: mile per second: mps ≡ ...
Converted to SI units, 1 darcy is equivalent to 9.869 233 × 10 −13 m 2 or 0.9869233 μm 2. [4] This conversion is usually approximated as 1 μm 2 . This is the reciprocal of 1.013250—the conversion factor from atmospheres to bars .
D is the diffusion coefficient (in m 2 /s), D 0 is the maximal diffusion coefficient (at infinite temperature; in m 2 /s), E A is the activation energy for diffusion (in J/mol), T is the absolute temperature (in K), R ≈ 8.31446 J/(mol⋅K) is the universal gas constant.
p = bearing pressure(N/MM2) For any given bearing, there is a value for indicated by C, for which the coefficient of friction is at a minimum. The bearing should not be operated at this value of bearing modulus, since a slight decrease in speed or a slight increase in pressure will make the part of a shaft or axle that rests on bearings operate ...
Accounting for two states of spin, each n-shell can accommodate up to 2n 2 electrons. In a simplistic one-electron model described below, the total energy of an electron is a negative inverse quadratic function of the principal quantum number n, leading to degenerate energy levels for each n > 1. [1]
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In square mils, the area of a circle with a diameter of 1 mil is: = = = = ( ) = . By definition, this area is also equal to 1 circular mil, so = . The conversion factor from square mils to circular mils is therefore 4/ π cmil per square mil:
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