In physics, the proton-to-electron mass ratio, μ or β, is simply the rest mass of the proton (a baryon found in atoms) divided by that of the electron (a lepton found in atoms). It is one of the fundamental constants of physics.It has a value of about 9.109 × 10 −31 kilograms or about 5.486 × 10 −4 daltons, equivalent to an energy of about 8.187 × 10 −14 joules or about 0.5110 MeV. {{Physical constants|e|ref=only}} NIST publishes the CODATA value of the elementary charge.
recommended values.
electron mass in u: Numerical value: 5.485 799 090 65 x 10-4 u : Standard uncertainty: 0.000 000 000 16 x 10-4 u : Relative standard uncertainty: 2.9 x 10-11: Concise form 5.485 799 090 65(16) x 10-4 u : Click here for correlation coefficient of this constant with other constants µ MASS 2010 CODATA (MOHR 12) gives the conversion factor from u (atomic mass units, see the above datablock) to MeV as 931.494 061(21). electron mass energy equivalent in MeV: Numerical value: 0.510 998 950 00 MeV : Standard uncertainty: 0.000 000 000 15 MeV : Relative standard uncertainty: 3.0 x 10-10: Concise form 0.510 998 950 00(15) MeV : Click here for correlation coefficient of this constant with other constants Often, the charge-to-mass ratio can be determined from observing the deflection of a charged particle in an external The ratio of electrostatic to gravitational forces between two particles will be proportional to the product of their charge-to-mass ratios. Could we find and repair the lunar rovers?Want to be part of the questions show? The charge-to-mass ratio of an electron may also be measured with the Measurements of the Zeeman effect commonly involve the use of a Rearranging, it is possible to solve for the charge-to-mass ratio of an electron as The compilation of the 2014 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use has recently been completed by its Task Group on Fundamental Constants (TGFC). Ear-lier values use the then-current conversion factor. CODATA constants package. The primary determination of an electron’s mass comes from measuring the ratio of the mass to that of a nucleus, so that the result is obtained in u (atomic mass units). When charged particles move in electric and magnetic fields the following two laws apply: This “New SI” will be based on exact numerical values for Get every new post on this blog delivered to your Inbox. Mass equivalent of the energy of a photon at the peak of the spectrum of the cosmic microwave background radiation (0.235 meV/c 2) 10 −36: 1.8 × 10 −36 kg One eV/c 2, the mass equivalent of one electronvolt: 3.6 × 10 −36 kg Electron neutrino, upper limit on mass (2 eV/c 2) 10 −31: 9.11 × 10 −31 kg
Four of the other fundamental physical constants are Given that it is a fundamental physical constant, no surprise that Universe Today has some articles on it! Overall, the recommended values fundamental constants have become more accurate, i.e., their uncertainties have decreased, due to improved measurements and theoretical calculations of the measurable quantities that depend on the constants. Together with the particle's initial conditions, it completely determines the particle's motion in space and time in terms of This differential equation is the classic equation of motion of a charged particle in vacuum.
1. The selection and assessment of data is done under the auspices of the CODATA Task Group on Fundamental … The conversion error 0.000 000 000 51 x 10-27 kg.
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