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Reference.org
Time projection chamber
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<p>In <a href="/facts/Physics/a7aH2y08">physics</a>, a time projection chamber (TPC) is a type of particle detector that uses a combination of <a href="/facts/Electric_field/tt4MooBs">electric fields</a> and <a href="/facts/Magnetic_field/Ta8Ev588">magnetic fields</a> together with a sensitive volume of gas or liquid to perform a three-dimensional reconstruction of a particle trajectory or interaction. </p>