mass fraction
71packing fraction — /ˈpækɪŋ frækʃən/ (say paking frakshuhn) noun 1. the difference between the mass of an isotope on the physical scale of atomic weights, and its mass number, divided by the mass number; often multiplied by 10 000 for convenience. 2. the fractional… …
72packing fraction — Physics. a measure of the stability of an atomic nucleus, equal to 104 multiplied by the mass defect and divided by the mass number. [1925 30] * * * …
73mole fraction — in a system, the ratio of the mass in moles of a component to the mass in moles of all components …
74cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …
75Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …
76Concentration — For other uses, see Concentration (disambiguation). In chemistry, concentration is defined as the abundance of a constituent divided by the total volume of a mixture. Four types can be distinguished: mass concentration, molar concentration,… …
77Parts-per notation — One part per trillion (1 ppt) is a proportion equivalent to one twentieth of a drop of water diluted into an Olympic size swimming pool. In science and engineering, the parts per notation is a set of pseudo units to describe small values of… …
78Molality — In chemistry, the molality, b (or m), of a solvent/solute combination is defined as the amount of solute, nsolute, divided by the mass of the solvent, msolvent (not the mass of the solution)[1]: If a mixture contains more than one solute or… …
79Earth's atmosphere — ppmvThe composition figures above are by volume fraction (V%), which for ideal gases is equal to mole fraction (that is, the fraction of total molecules). Although the atmosphere is not an ideal gas, nonetheless the atmosphere behaves enough like …
80Single-stage-to-orbit — The VentureStar was a proposed SSTO spaceplane. A single stage to orbit (or SSTO) vehicle reaches orbit from the surface of a body without jettisoning hardware, expending only propellants and fluids. The term usually, but not exclusively, refers… …
