Sl
- Slant Range
- The direct line-of-sight distance between two objects not necessarily at the same altitude.
- Slap Back
- A discrete acoustic reflection from a nearby surface.
- Slate
- Fine grained metamorphic rock with strong cleavage planes.
- Slave
- A networked device that is controlled by another device. Slave devices do not initiate data transmission. They respond to commands or requests initiated by a master device.
- Sledge Hammer
- A large, heavy hammer usually with a long handle.
- Sleeve Bearing
- A journal bearing, usually a full journal bearing.
- Sleeve Valve Engine
- In the sleeve valve engine the conventional valve train was replaced by a ported cylinder liner that was then rotated to align with ports in the block so as to achieve the timing for the intake and exhaust strokes for the four-stroke cycle.
- Slew Rate
- The term used to define the maximum rate of change of an amplifier's output
voltage with respect to its input voltage.
- Slick Tyre
- A tyre that has no tread on it′s surface.
- Slide Bearing
- A bearing used or positioning a slide or for axial alignment of a long rotating shaft.
- Slide Hammer
- A tool with a long round shaft on which a hammer weight slides.
- Slide Rule
- A calculating device consisting of two sliding logarithmic scales.
- Sliding Friction
- The frictional force between two surfaces in relative motion.
- Slinch
- Equal to 12 slugs, an old unit of mass.
- Slip
- The difference between rotor speed and synchronous speed in an ac induction motor.
- Slip Angle
- The difference as an angle between the direction a tyre is travelling in and the direction the wheel is pointing.
- Slip Rings
- Devices for making electric connections between stationary and rotating contacts.
- Slip the Clutch
- To operate the clutch so that it partially disengages, as when keeping up the revs when driving off; causes wear on the clutch.
- Slipper Pistons
- Pistons with skirts with material removed, to reduce friction while maintaining strength.
- Slope
- The measure of the tilt of a line, the rise over run or how much the line moves up for every movement to the right.
- Slope of a Linear Function
- The slope of the line y = mx + b is the rate at which y is changing per unit of change in x.
- Slot
- A narrow aperture.
- Slot Drill
- A cutting tool that is used in a milling machine. It can be plunged into the material and then moved to form a slot.
- Slow Charge
- Charging at a rate of about 5-10% of a battery′s rated capacity.
- Sludge
- A deposit, principally composed of insoluble resins and oxidation products from fuel combustion and the lubricant, that does not drain from engine parts but can be removed by wiping with a cloth.
- Slug
- An old unit of mass. 1 slug = 14.5939 kg
- Sluggish
- Unresponsive, functioning at below normal rate or level.
- Slurry
- A liquid that has a very high level of suspended solids.
- Slush Hydrogen
- A mixture of liquid and frozen hydrogen that is denser than liquid hydrogen.
- Slush Oxygen
- A mixture of liquid and frozen oxygen that is denser than liquid oxygen.