单词	standard state
释义	standard state A state of a system used as a reference value in thermodynamic measurements. Standard states involve a reference value of pressure (usually one atmosphere, 101.325 kPa) or concentration (usually 1 M). Thermodynamic functions are designated as ‘standard’ when they refer to changes in which reactants and products are all in their standard and their normal physical state. For example, the standard molar enthalpy of formation of water at 298 K is the enthalpy change for the reaction H2(g) + ½O2(g) → H2O(l) ΔH298 = -285.83 kJ mol-1. Note the superscript is used to denote standard state and the temperature should be indicated
随便看	radium radius of curvature radius of gyration radius vector radon rainbow RAM Raman effect ramjet Ramsay, Sir William Ramsden eyepiece random alloy random walk Rankine cycle Rankine temperature scale Raoult's law rarefaction raster rational number rationalized Planck constant rationalized units ray Rayleigh criterion Rayleigh scattering Rayleigh, Lord

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