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Membrane Electrochemical Potential Term

Calculate the signed electrical zF delta-V contribution to molar electrochemical potential from explicit quantities, excluding the chemical term.

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Description

Calculate a supplied membrane electrical molar-energy term.

Biophysical scalar models require explicit signal, concentration, temperature, energy and geometric conventions. Effective concentration differs from dimensionless activity, a single displacement differs from mean-square displacement, and a fluorescence yield ratio needs absorption and refractive-index corrections. Supplied model parameters do not establish that the model applies to an experiment.

Calculate a supplied membrane electrical molar-energy term.

When to use this tool

Use Membrane Electrochemical Potential Term when you already have chargeNumber, suppliedFaradayConstant, voltageDifference and need to calculate a supplied membrane electrical molar-energy term.

How to use the tool and how it works

  1. Enter chargeNumber, suppliedFaradayConstant, voltageDifference. Use the units and conventions below.
  2. Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
  3. Read electricalMolarEnergy. Use the output convention below.

Require signed safe integer chargeNumber and positive finite suppliedFaradayConstant; return chargeNumber*constant*voltageDifference.1

A volt times a coulomb is a joule. With Faraday constant in C/mol, the electrical term is molar energy in J/mol.2

Input fieldMeaning and unitsAccepted input
chargeNumberCharge NumberRequired. Safe integer.
suppliedFaradayConstantSupplied Faraday ConstantRequired. Finite number; strictly above 0.
voltageDifferenceVoltage DifferenceRequired. Finite number.
Output fieldInterpretationReturned shape
electricalMolarEnergychargeNumber*suppliedFaradayConstant*voltageDifference; C/mol times V gives J/mol, excluding the concentration-dependent chemical term.Required. Finite number.
json
{
  "input": {
    "chargeNumber": 1,
    "suppliedFaradayConstant": 96000,
    "voltageDifference": 0.05
  },
  "output": {
    "electricalMolarEnergy": 4800
  }
}

Limitations and assumptions

  • With F in C/mol and voltage in V, output is J/mol. This is the electrical term only, not chemical concentration potential, full electrochemical potential, membrane voltage or a biological conclusion.
  • Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
  • Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.

Alternative or Complementary methods

Use the complete physical model, calibrated measurements and uncertainty analysis. Check reference states, photon-signal bases, diffusion assumptions and binding-constant conventions before interpreting local contributions as physical measurements.

References

  1. Calculation and input contract: biophysics/membrane-electrochemical-potential-term — tool.io

  2. The International System of Units (SI), 9th edition — BIPM

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