#engineering noun
- Jet engine — An air-breathing jet engine (reactive) that utilizes surrounding air as an oxidizer for burning fuel and generating propulsion force through the rapid expulsion of exhaust gases. Unlike rocket engines, this structural mechanical assembly fully depends on the presence of Earth's atmosphere to function, being widely used in modern airliners and supersonic aircraft.
- Atmospheric sounding — An experimental method or technical procedure for investigating the upper layers of Earth's atmosphere by launching sounding balloons, meteorological rockets, or drones specially equipped with measuring instruments. This structural process enables the determination of the vertical profile of temperature, pressure, humidity, and wind speed, providing fundamental data for weather forecasting.
- Aerotonometer — A laboratory apparatus or precision technical device used to measure the partial pressure or tension of gases dissolved in a liquid (such as blood) by means of hydro-gaseous equilibration. This structural instrument consists of sealed analysis chambers and fine barometric sensors, being essential in respiratory physiology research.
- Notch — A notch, deep indent, profiled groove, or small slot intentionally made on the surface of a mechanical part, instrument, or structural material. Its functional role is to allow guiding, locking, correct assembly with another component, or to serve as a controlled failure point in materials resistance testing.