Axial compressors consist of rotating and stationary components. Chairs may be either stationary or portable models. Ellipticals produce an intermediate range of leg motion between that of stationary bikes and treadmills. Evans incorporated his cylindrical boiler into several engines, both stationary and mobile. Surface gravity for stationary black holes is well defined. Essentially, molecules undergo electrostatic interactions with opposite charges on the stationary phase matrix. This assumes the ship remains stationary and upright. There are two general types of bottlenecks, stationary and moving bottlenecks. Synthesis requires specific nutrient conditions in either stationary or submerged aerobic conditions. Such batteries are in use in stationary storage systems. The wagons were loaded on and off with the use of stationary steam engines. They are typically modelled as either trend stationary or difference stationary. The quantity of electrostatic force between stationary charges is always described by Coulomb's law. One corresponding concept in mechanics is the principle of least/stationary action. Supplied air respirators make use of a hose to deliver air from a stationary source.