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Powder wettability measurement with the Washburn method. In its most general form the Lucas Washburn equation describes the penetration length ( L {\displaystyle L} ) of a liquid into a capillary pore or tube with time t {\displaystyle t} as L = ( D t ) 1 2 {\displaystyle L=(Dt)^{\frac {1}{2}}} , where D {\displaystyle D} is a simplified ...
Trachtenberg called this the 2 Finger Method. The calculations for finding the fourth digit from the example above are illustrated at right. The arrow from the nine will always point to the digit of the multiplicand directly above the digit of the answer you wish to find, with the other arrows each pointing one digit to the right.
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In chemistry, fractional crystallization is a stage-wise separation technique that relies on the liquid–solid phase change. This technique fractionates via differences in crystallization temperature and enables the purification of multi-component mixtures, as long as none of the constituents can act as solvents to the others.
An Egyptian fraction is a representation of an irreducible fraction as a sum of distinct unit fractions, such as 5 / 6 = 1 / 2 + 1 / 3 . As the name indicates, these representations have been used as long ago as ancient Egypt , but the first published systematic method for constructing such expansions was described in ...
Donald Trump will be sworn in as president in the Rotunda of the U.S. Capitol on Monday, after the forecast bitter cold prompted planners to move the ceremony under the building's neoclassical ...
A federal judge on Tuesday ordered U.S. health agencies to restore websites that they abruptly took offline in response to an executive order by President Donald Trump telling them to scrub ...
The method of equating coefficients is often used when dealing with complex numbers. For example, to divide the complex number a + bi by the complex number c + di , we postulate that the ratio equals the complex number e+fi , and we wish to find the values of the parameters e and f for which this is true.