The First Khmer Physic Formulas on Play Store. Khmer Physic Formulas is designed with simple UI, fast and smooth. Khmer Physic Formulas has collected all formulas such as: Grade 7. Grade 8. Grade 9. Grade 10. Grade 11. Grade 12. Basics Physic Formulas. Physic for Engineering. SI Units. Constants value. Symbols.