| angle of internal friction | เสียดทานภายใน |
| internal energy | พลังงานภายใน |
| internal friction | แรงเสียดทานภายใน, แรงฝืดภายใน |
| internal stress resultant | หน่วยแรงรับภายใน |
| internal vibrator | เครื่องสั่นภายใน, เครื่องสั่นหัวจุ่ม |
| internal virtual work | งานสมมติภายใน |
| Ball Piston Pumps | (english) The Ball Piston Pump is a very simple pump design. It has a rotor which revolves around an internal stator. The rotor has twelve cylinders machined out of it, and each cylinder has a ball inside which can slide in and out of the cylinder. |
| BURST PRESSURE | (english) The level of pressure at which a component, pipe, tube, hose or other fluid passage will burst during application of internal pressure. Normally 2.5 - 4.0 times working pressure. |
| Axial force: | (english) A system of internal forces whose resultant is a force acting along the longitudinal axis of a structural member or assembly. |
| Bending moment: | (english) A system of internal forces whose resultant is a moment. This term is most commonly used to refer to internal forces in beams. |