This paper by Daniel L. Decker presents a high-pressure equation of state (EOS) for NaCl, KCl, and CsCl using a Mie-Grüneisen equation. The calculation was repeated with more accurate values of the zero-pressure compressibility and extended to KCl and CsCl. The approach is shown to yield pressures with similar accuracy to experimental measurements above 25 kbar, providing a practical pressure scale. The EOS was validated through comparisons with experimental data on thermal expansion, adiabatic bulk modulus, and phase transitions. The calculated pressures are found to be accurate, with uncertainties comparable to experimental uncertainties. The theory's accuracy is comparable to current experimental capabilities, making it suitable for pressure calibration and conversion to new pressure scales. The agreement with dynamic measurements using shock techniques and the Murnaghan two-parameter equation further supports the validity of the EOS.This paper by Daniel L. Decker presents a high-pressure equation of state (EOS) for NaCl, KCl, and CsCl using a Mie-Grüneisen equation. The calculation was repeated with more accurate values of the zero-pressure compressibility and extended to KCl and CsCl. The approach is shown to yield pressures with similar accuracy to experimental measurements above 25 kbar, providing a practical pressure scale. The EOS was validated through comparisons with experimental data on thermal expansion, adiabatic bulk modulus, and phase transitions. The calculated pressures are found to be accurate, with uncertainties comparable to experimental uncertainties. The theory's accuracy is comparable to current experimental capabilities, making it suitable for pressure calibration and conversion to new pressure scales. The agreement with dynamic measurements using shock techniques and the Murnaghan two-parameter equation further supports the validity of the EOS.