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Theory in Practice
Published in John D. Constance, Controlling In-Plant Airborne Contaminants, 2020
Dalton's law of partial pressures states that, in a mixture of gases, each gas exerts the same pressure as it would exert if it were present alone in the occupied volume of the mixture. Each component gas exerts its own "partial pressure." The sum of their pressures equals the total pressure (P). Thus P=P1+P2+P3+⋯+Pn
Glossary of scientific and technical terms in bioengineering and biological engineering
Published in Megh R. Goyal, Scientific and Technical Terms in Bioengineering and Biological Engineering, 2018
Dalton (Da: John Dalton) is a unit of atomic mass roughly equivalent to the mass of a hydrogen atom: 1.67 × 10–24 g. The kDa or MDa are equal to 1 × 103 and 1 × 106 daltons, respectively.
Molecular Weight of Polymers
Published in Charles E. Carraher, Carraher's Polymer Chemistry, 2017
Generally, the larger the polymer, the higher is the molecular weight. The average molecular weight (M) of a polymer is the product of the average number of repeat units or mers expressed as the degree of polymerization (DP) times the molecular weight for the repeating unit. Thus, for polyethylene (PE), with an average DP of 100, the average molecular weight is simply 100 units times 28 Da/unit = 2800 Da. Note that amu and daltons are often used interchangeably as units.
John Dalton’s “Aha” Moment: the Origin of the Chemical Atomic Theory
Published in Ambix, 2021
Since Dalton had established that the absolute weight of a single oxygen atom was proportional to its corresponding combining part, the ratio of the combining parts for two different types of atoms would be equal to the ratio of the absolute weights of the atoms as well, so long as the two atoms were both combining with a standard weight of an element to allow for comparison. Dalton used a similar theoretical approach in 1802 when, after stating that he could not calculate the absolute distances between gas particles, he showed how he could calculate the relative distances compared to water as a standard.50