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Purchasing power (sometimes retroactively called adjusted for inflation) is the number of goods or services that can be purchased with a unit of currency. ... more
In celestial mechanics, apsidal precession is the precession (gradual rotation) of the line connecting the apsides (line of apsides) of an astronomical ... more
Wind-chill or windchill, (popularly wind chill factor) is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of ... more
A displacement is the shortest distance from the initial to the final position of a point. For motion over a given interval of time, the displacement ... more
Specific impulse (usually abbreviated Isp) is a measure of the efficiency of rocket and jet engines. By definition, it is the impulse delivered per unit of ... more
A lens is a transmissive optical device which affects the focusing of a light beam through refraction. A simple lens consists of a single piece of ... more
The orbital period is the time taken for a given object to make one complete orbit around another object.
When mentioned without further ... more
A compound machine is a machine formed from a set of simple machines connected in series with the output force of one providing the input force to the ... more
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