Spark chamber

https://www.wikidata.org/wiki/Q1474375

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Physics 31.7M papers	Chemistry 28.4M papers	Engineering 23.9M papers	Organic chemistry 12.8M papers
Mechanical engineering 5.3M papers	Thermodynamics 5M papers	Physical chemistry 3.1M papers	Aerospace engineering 2M papers
Automotive engineering 866k papers		Combustion 374k papers
Current
Spark chamber 993 papers
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