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Physics
The branch of science concerned with the properties of matter and energy and the relationships between them.
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Physics > General physics 
accelerometer
Physics; General physics
Device to measure the accelerate, used for the plane or the rocket.
acre
Physics; General physics
English unit of area measurement, equal 4840 square yards, equal 4046.86 square meter.
spherical aberration
Physics; General physics
The mirror or lens, causing image distortion in shape.
two-state quantum system
Physics; General physics
Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion.
ray
Physics; General physics
A narrow beam of light, heat, or some other form of radiant energy: The sun's rays are hottest in the middle of the day.
Hidden variable theory
Physics; General physics
Historically, in physics, hidden variable theories were espoused by some physicists who argued that quantum mechanics is incomplete.
Vector operator
Physics; General physics
The vector operator is that operator that turns the spin / vector in different directions.
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